The 1" come in those sizes but 30mm only 5 and 10.
If you want more elevation you can put the -10 in the front ring as well as the +10 in the rear, to get an extra 10moa. But you haven't solved the gruntier ring issue.
The Leupold website lists some of their VX3s having 120ish moa so that could be an option. Or look for another scope with more adjustment.
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