Switching from split fingers to 3 under, your subconcious mind tells you that "You're aiming too high, lower the bow!!" Reverse that in this sitution. Your gaps will be differnt. Shooting 3 under brings the arrow up closer to your eye especially if you're anchoring with the middle finger in the corner of your mouth. Find out where your " point on" is while shooting 3 under, keep moving back ( if you can ) until the point of your arrow is on the target. I'm guessing but with a 35# bow @28" the point on will be around 30 yds. Once you know where your 'point on' is you'll be able to gap ( estimating the apparent distance between the point of your arrow and the target) better, when you go beyond your 3 under point on, switch back to split finger, and find that "point on". Now you are begining to "walk the string". Add changing anchor fingers and you're face walking. This was copied from a post I made this morning over on MartinTech Traditional forum, those guys were shooting 35# bows and asked this question in reverse. :D