pinion angle opinions wanted

You want 4 degrees less then the shafts angle, unless you have a ladder or link then you want 1.5 to 2 degrees.

Right now you have 3.7 on the shaft running down, and the pin is .5 +, under excel that could be 4 to 6 + which should give you some vibe under hard excel.

You need to point the pin down 6-.