4 11/32 X 4 15/32 is PERFECT, just can't find anyone around here who can consistently drill to within 1/32 of an inch, and I usually end up with 4 3/8 X 4 1/2. They tell me I shouldn't be able to "FEEL" 1/32 difference, but I proved to my driller I can and he didn't hardly believe it.
I am right handed and use ZERO forward/reverse pitch in the fingers, with my middle finger zero lateral and my ring finger 3/8 right ( away ) lateral.
My thumb I use a 1 3/64 oval insert at 50 degrees rotation with 1/4 reverse and 3/8 left (away) lateral.
My thumbhole is offset to the left of grip center by 3/8 inch which leaves my thumbhole directly below my middle finger hole. ( Many claim this is impossible and only amounts to a raised ring finger, but there is some geometric difference because I can clear one well and the other not so well)
--------------------
Good transactions list in my profile
Check out this fun game:
http://kongokid.mybrute.com
