Clearance with dry vs wet clutches

I've got another question - I think I was measuring my front drum clearance wrong because my front top pressure plate has a step in it. Not my photo, but like this:

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Munro mentions machining the pressure plate but if he mentions how to measure one that is cut I didn't find it. It seems like I need to use an allen wrench instead of a feeler gauge so I can get under the snap ring without the thicker part of the plate interfering, right?

It has 5 frictions in it so per Munro it should be .075. I can get a 7/64 (0.109) allen wrench between the pressure plate and the snap ring. If that is the right way to measure the stepped pressure plate then it is too loose, not too tight. In my case there is .02 clearance per friction instead of the recommended .015. The transmission worked fine (other than the creeping reverse) so I wonder if I need to worry about that?

I get the feeling that whoever originally set this transmission up just slapped new parts in it and didn't measure anything.

If it matters, there are 15 springs in it.