If you can find me some vids showing that its possible to do what you saying I would love to see it, as I wanting to learn as much as I can also. Because what I'm see everyone doing is adjusting the rest so the BH will hit where the FP just did, but they never shoot a FP after to show that they'll indeed hit in the same spot after the rest is moved. If your moving the rest to adjust for the flight of the BH, the field point will move just as far as the BH . So if your BH was hitting low left as compared to the FP and you adjust the rest to fix it. You FP is now going to hit high right every time. I've been tuning my bow along with my brothers bow and 3 of my hunting buddies for the last 10 years, and all of our bows will put our BHs the same exact place as a FP from 10 to 60 yards. And this is with us guys using 3 different brands of BHs.
I've shot a ton of different BHs over the years and there's a couple handfulls that I found to fly the same as a FPs, I can also take one of my brothers arrows and BHs and it will hit right where mine will with no adjustments to the rest or sight. I shoot Maxima Blue Streaks with T3s and he shoots whatever Redhead carbons that happen to be on sale at BPS and 2 blade rages, I was shooting NAP spit fires before I switched to the T3s and they fly just the same as the T3s or rages. Now if you was to try and do that same side by side with a muzzy and a thunder head they will hit 2 different spots every time, I know this because they were some of the first BHs that I ever used and I've done the comparison. Now the reason that they hit in two different spots is because of the blades and how they plane out going through the air. Now if you was to take the blades off them same two heads and shoot them they will hit the same spot, but only without blades and again I've tried this myself. The only reason I even switched for the spitfires to the T3s is the damage that is caused by the T3 compared to the spitfire.