Try a higher anchor point. I recently switched from middle finger to corner of mouth to my index finger on top of my cheekbone. Raised my anchor about an inch. I'm curious though if it's the limb in the way or your focus switching back and forth from target to arrow or bow?
Great suggestion. This last year I actually switched to 3 under and anchored at my cheekbone. It greatly reduced the occurences of my none dominant eye winning out for the shot itself. I like some aspects of shooting 3 under, one of which is actually utiilizing a site window. In 11 years of shooting a bow, I'd never used a sight window due to having a lower eye tooth index finger anchor. I actually may do a write up at one point on how much a sight window can really help with accuracy at some point. The reason I'm thinking of going back to split is it just feels more natural to me, especially being an instinctive shooter.
In order for me to shoot accurately 3 under the arrow has to be aligned in my peripheral vision. I rely on that alot more than when I shoot split (split I don't really notice the arrow at all). 3 under really works nice for target shooting and time when I have the luxury to settle into a shot. But on faster or moving targets where quicker reaction is needed, all the advantage I gain through 3 under seems to go out the window.
Having said that both styles are great, just different for me personally. What struck me about shooting the english longbow was that I shot it split finger and did'nt have the eye issue a single time. (Probably first session in my life where I can say that definitively). And the one thing that popped into my head was the width of the bow itself. The reason being I have had to return certain takedown bows due to the riser flaring out into my dominant eyes line of sight when shooting split in the past. So I've experienced the extremes of this issue (where the riser really is in my line of sight), the less extreme where it falls more in between and I have to cant to avoid, and with this english style bow I did'nt experience it at all.
Having said all that, I'm going to experiment more with the english longbow and see if the eye issue continues to be a none issue. I definately know that I am gripping the bow differently in order to get clean arrow flight (more toword the joint of my thumb, almost like carrying a suitcase). So perhaps the grip is positioning the bow in a different alignment that is not interfering with my dominant eye. I'll probably experiment with the wider bows I have and see if grip can make a difference as well.
Thanks a ton guys! You all are giving great advice and helping me to work through this to figure it out.