We are closing in on deer season here. (oct 1st) and I feel as if I have made a terrible mistake. I played around with 3 fingers under and have been shooting more accurately. Should I go back to split finger and focus after the season or roll with it. Everything seems to be bare shafting fine.

Only you can know what your comfortable with .
What's going to happen when you get excited at the moment of the hunt ?
Whitch way is what you will do without thinking ?

I switched recently and in no time at all I was shooting as if I had shot 3 under forever. Your brain will imprint quite quickly. I'd say go with it. Just stay committed and don't jump back and forth. I feel 3 under is best for us easterners, where shots are generally 20 yards or less. Just my opinion though.
John