I am wondering how I can tell what kind of mixture I'm getting at high
RPM's or at least how do I tell if this things adjusted correctly? It
seems that the throttle linkage increases the oil delivery as the
throttle is opened. The rotating valve(?) on the oil pump is adjusted
so it's never pinned all the way open or closed. It's partly open with
no throttle, and it's more open at full throttle, but not completely
open. Any chance I'm getting too much oil at full throttle? Any ideas
how to check the adjustement?

Look for sustained oil smoke under load at full throttle. If it continues
to produce visible smoking the oil ratio is fat at about 30:1 down to even
maybe 20:1. If it were fatter than 20:1 the smoke would be really thick.
At 40:1, and up the smoke is nearly invisible, at least after giving the
engine about 1 minute to clear itself under load. This is about as close
as estimated guessing will get you. If you were losing power due to excess
oil, the smoke would be so thick you would know right away, and the plugs
would probably be fouling really quick.