Anchour position can make a big difference.
My 3 under anchour gives me a Point on distance of 35 yards with my heavy EFOC hunting arrows.
The same arrows but shooting split which is only one finger width lower than with 3 under,I get a point on of 50 yards.
3 under with my ultra light wheight 8% FOC target arrows an my point on is 50 yards.
I've never shot those arrows split fingered,but I'd guess they'd be hiting dead on at around 60-70 yards.
What all this means to me is that when shooting our style of 3D I'm never shooting beyond my point on,so my margin of error in my tradjectory is very slight,and my over all sight picture doesn't change very much at all.
In the hunting field with my heavy arrows,the same narrow sight picture applies but the distance stays under 35 yards.
I'm looking at getting totaly away from both 3D and IFFA type field archery in the very near future,and joining my local FITA club,,,,I belive that with my current target set up I should be able to find a repeatable chin anchour point and extend my point on to 90 yards or more with little effort.
Anyway,,,arrow speed,arrow length,anchour point,FOC,they all play a part.