Hey all, I wanted to post an update from the weekend.
Bench testing seemed to show a very strong solenoid action...snaps out and in with authority.
The teeth on the flywheel and starter are not marred (probably from minimal use thus far) but I can get an idea of depth of engagement based on where the starter gear is shiny. I'll post a few pictures later today.
I tried placing shims in an effort to change the mesh. I've currently got 3/32 worth on the bolt that is furthest from the flywheel. I don't really like this, though, as it seems like it'd have to stress the mounting ears of the starter with mismatched shimming. But this did seem to help. It catches every few times rather than all the time.
What I'll also try is shimming the starter straight out; I'd prefer this method if it works. It's all pretty easy to try, just have to steal the time to do it!
There were a couple prior questions I can answer:
Do I have the inspection cover in place? I do...but it is an aftermarket piece...perhaps of thinner gauge than the stock one would have been!
I'm pretty confident in the electrical being ok, especially after bench testing the solenoid.