how do you know you are on the flats of the Allen wrench or on the high spots? In accurate measurement is highly possible. I’d use a round rod and bend it to the L shape.
Also you can measure anyplace you can get the gauge in there, it doesn’t have to be at the top of the snap ring. It can be under there on a friction disc, but use a flat feeler gauge so you don’t gouge the friction.
I like .100 with 5 frictions
.075 seems on the tight side.
do you need 5 Discs? 4 is plenty for most applications.
maybe you have pressure to the rear clutch in P or N? What is the valve body and the mods done to it?
I can rev to 3000 doing timing and they don’t creep forward.
