No not THAT kind of tow-ins! Actually I need information about the toe-in angle for side fin placement. Specifically for 6’1" x 20.5" x 2.5" fish. I’ve heard lining the fin axis anywhere from on the nose to 4 inches out. I’ve been wondering how the fin axis affects performance.
I generally toe my fins in 3/16".You can also use a straight edge like you said,and measure 2"-2 1/2" out from the nose also.Good luck.TEDK.