Another option, if you don't want to part with the rifle long enough for a smith to install a 20 minute base, is to get a set of the Signature series rings with the inserts, They should give you an additional 10 moa at least on your current setup.
I agree with previous post, mounting scopes is sometimes like a box o chocolates.........you just never know what you might get
Just as a sidenote, are you sure the picatany rail is on correctly, and not backwards? Stranger things have happened, I've seen it firsthand. Didn't even notice it till I went to boresight and there was little room left for up. Quick fix though, just swapped the base around 180 degrees, then boresight was centered both horizontal and vertical.