You guys, you guys. OK I guessed and drilled the holes 1/8" forward which should move the rudder forward about 3/8" in the middle. You can check back with me in the spring, late spring, and ask me how that is working for me.
There's an adjustment on the top of the H20 tiller arms to make sure that the cam is fully engaged. I guess if you like slop you could use that to adjust rudder rake.
Using washers under the top gudgens is actually a pretty good idea for a quick check. I'm horrified, of course, at the idea. My little 1/8" nudge is probably about 3 washers. Presumably the factory made the plates inside a reasonable size assuming the bolts would be fully engaged. However, my problem is resolved for now, and I'll start checking and redrilling in the spring.

Have a happy New Year!