Very cool. I shoot with present and past national champs all the time;) A bubble level is key to reducing those left and right mystery shots from cant. You might want to give the extra inch of scope height a try. One advantage is you aren't craning your neck so much to look through the scope(my main reason for the height as I'm suffering from a pinched nerve in my neck at the moment.)
I think the main advantage going to 16x will be they will be a little bit better at ranging the yardage!! We shall see!!! Even at twelve power I cant say that I couldn't fine aim at the short distances we shoot field target at, 16x may just show the shakes more!! Have to wait and see! Ha Ha!!