RE: arrow tuning
There is always a complex answer available on this subject. A virtual
minutia of conflicting physics mixed with actual experience.
So let's skip all that and tell you to go and buy a six pack of Magnus two blade BH's. Not the fancy ones, just the plane Jane broadheads.
I've battled that problem for the entire 12 years I've been shooting bow. I've used Thunderheads, mechanicals, and more recently the NAP Crossfire's and I always ended up re adjusting my sights for the BH's and then having to change back for field points. Every season!
Not now. I screwed three Magnus 2 blades to my arrows and immediately was hitting dead on at 20 - 30 - 40 - even at 50 yards!!!!!! In fact, They were hitting so close to the field points, that I had to refletch some of them because the BH's cut the fletchings.
So stop f*#^ing around with tunings and adjustable frustrations . . . try the Magnus fix.
Also happens to have superior penetration over the three blades I'd been using. I tested it!
Now you can concentrate on form instead of function.
Good hunting