I have a Hoyt Magnatech, 60# DW, 27.5" DL that I have about 350-400 shots on a new vapor trail string and cables.
Up until this past Sunday, I had my BH's hitting the same as my FP, with seeingly very strainght and consistent flight. I am shooting easton axis ST 400's with 100grn crossfire BH, shaft length of 27.75". According to the Easton guide 27" DL at 60# should use the 500's and 28" DL @ 60# should use the 400's, so after some feedback went with the 400's.
First time shooting the st 400's with crossfires I was about 6" higher than with BH's, so raised my noc and was right on the same spot as the fp's.

All of a sudden, with know known reason to me (such as damaging something or actually changing my set-up), as of Sunday my BH's started hitting 5-6" to the left of FP's. I shot more than one from stand and ground to see if it was form, but the same consistent spot. I looked for clearance issues and did not detect any, even after putting some baby powder on 5 arrows and shooting.
When I loosened my rest, NAP 1000 dropawayto adjust a little toward the riser, I noticed that the small mounting screw was broken, but the main larger mounting screw was intact.
I went ahead and moved the rest a little right, but in process moved the launcher higher and ended up setting it back down to where it appeared before fiddling with i, but still had it moved a little right as intended.
Next time shooting my FP's are now about 6" low and 6" to the right. BH's hitting where I aim, but I can see almost a curve to the shot, as like a curveball more than a fishtail. FP's appear to shoot straight but not impacting where I aim.
Any ideas that a novice such as myself could check prior to bringing into the shop that may correct this unexpected issue?
Any help would be greatly appreciated.

Not sure why it seemed to be on, and then moved to shooting broadheads left. A lot of people just starting out move a rest too far to make corrections. When I was tuning broadheads this year, they were shooting about 2" straight high from field points. I know I moved my rest down less than 1/32" to correct the problem. The 400 spine arrows should work fine. IME, it is better to be overspined than under, at least where broadhead accuracy is concerned. I would look at the bow from the back, and look down an arrow shaft that is on the rest and string. When looking down the arrow, the string should appear to be pretty close to the middle of the grip's width. When looking at your bow from the open, or sight window side, the arrow should appear to be level, and cover the rest mounting holes on the riser. If you set the bow up like that, and broadheads are way off, and consistently way off, then go to a good pro shop and have them take a look at the setup.

Thanks for the feedback. I am sure that I am low with BH's as I likely need to move the rest up a bit, but can't quite understand why my bow, shaft and BH combo went from hitting very well and same spot as FP's to all of a sudden being off 5-6" to the left and after moving rest in/right, no being on with what looks like a curve left to right and then my FP's 6" right and low?
What it be worth trying to go up to 125grn BH's, slick tricks or mechanicals?
I do not notice anything mechanically different while shooting?

Crossfires are pretty low profile heads, so they should not be a problem, but they do have little tabs at the back of the blades that are designed to spin the head to the right. If you are using left helical or offset fletching, it may cause a problem. I personally use Slick Tricks, and they fly very well, right with my field points out to 40 yards. Mechanicals are fine too, but it sounds like the tune is off just a bit.

You make sense. In mentioning trying heavier BH's, 125's, I was wondering if adding some weight, such as suggested in the Easton Tuning guide would help straighten BH's out?
I have been shooting the easton's with the fletchings that came on them when I bought a half dozen to try. They are offset some. I figured give them a whirl with the fletchings that came on them, before refletching with something else, adn after they were apparently flying and hitting well, I figured why change?

Could possibly be yoru strings are streatching or settling in. Have you checked your wieght out? BH's that far to the left is astiff condition.

I have not yet checked my DW out recently. Could you explain a little more what you mean by "a stiff condition?" Are you refering to spine or other? Thanks.

Yep, when BH tuning if you can't get out a left condition, your arrows are stiff. Most guys just up thier wieght. But if you have new strings, your cable could have settled in some. And lost some poundage

Ok, I guess I can understand that. Is it common for strings to suddenly settle and lose some poundage? Just a bit frustrating that with my limited time I had the easton 400's with crossfires flying and hitting very well and then unexpectently hitting left.
I guess I will just have to check weight. So would you put a few twists in the string if poundage has dropped in order to get the weight back, as the limb are tighted down all the way?

Remember, take twistsout of a string to increase poundage, and put twists in the cable to increse poundage.

I would first check the poundage. Its your cable maybe.

These days with these strings, I notice its rare for a cable to settle in and lose more than pound of wieght. But on one bow I have I put FF on it, and it will lose wieght over time.