Tony if you want to get closer to optical center, get the Burris "Z" rings, medium ht. https://www.midwayusa.com/product/1548398483/burris-30mm-signature-zee-weaver-style-rings-matte
That will come with a 2 sets of +/- .010" inserts that should be about what is needed depending on your ring spacing. If your rings are spaced 4" apart you will get roughly 20 MOA of adjustment. Or just use 1 set of .010" inserts and get 10 MOA. They can also be used to offset windage .
Charter member of Over The Hill Gang