RE: Broadhead tuning
It is questionable which is actually more precise. Bareshaft tuning is actually for finger shooters to determin the proper spined shaft for thier set up. However it works very well for release shooters if you want your arrow as straight as can be off the rest.
There are two schools of thought on this one. One will say if you are going to shoot fixed blades, tune with them. That assures you the arrows are going where you want them in the configuration you want them in when hunting.
The other school will say that you actually detune your bow when trying to make fixed blades group to the exact same point as field points. The thinking that bare shaft tune, walk back tune and group tuning will give you the best tune. Once you get it as good as you can leave it alone. If it shoots different with fixed blades simply adjust the sights a little bit, it shouldn't be too far off.
I am kind of inbetween the two. I bare shaft tune and then will check to see how it shoots with fixed blades. Depending on far off it is I may adjust it, or I may not. The most important thing to me is that the arrow flies and impacts straight. I am not going to sacrifice this to get the the hunting arrows to impact exactly with the target arrows. If they are a little off I will either move the sights or compensate for it when hunting. I am more concerned with how they group, not where they hit. That is an easy fix.
Paper tuning is a nice beginning to see if anything is way off, but by far the end of the process. Like Aussie, I rarely even mess with it. I eye ball everything when setting it up and then bare shaft tune from there starting at 10 yards and working back.
I say if your windage is good and you are shooting a bit low change your nocking point sligtly and see what happens. You can move your rest instead of your loop if you want. Just move the rest in the opposite direction you would move the loop. Remember to do it in very small amounts though.
You could also try using more fletch, sometimes that helps. The less fletching you have the more criticle your tuning becomes.
Paul