utg 3/8 to 7/8 adaptor picatinny scope mounting on condor

Does anyone else have one of these. I bought three of them off of ebay. I mounted one on the bottom of the frame to attach my IR for my Night Vision. I put the other two on scope rail. They seem to be well made. The problem I had—although its not truly a problem, just one of those things that bothers me—is that when I mounted my scope to the rail I had to eat up alot of elevation to bring my point of aim in line with my point of impact. Now the scope I am using has plenty of moa available for this, but it just feels wrong using up so much. I understand this is not some “thousand yard” rifle (were talking a condor .22) and I won’t truly need elevation…but as I said, it felt wrong and from a fundamental viewpoint, I’m sure most would agree it is not good practice to eat up elevation on bore sighting. Now my question is this: Does anyone have any experience shimming their scopes on their condors??? I used two shims that worked well, but when I tightened everything down, these shims, no matter how many times I adjusted them or grinded a little here and their…seemed to pull the scope off to one side, making me use up windage to correct it. When you look at the rifle you can notice it is off to one side, and that drives me nuts. Anyway, I appeal to the many experts in this great forum for any past experience with whatever mounts, or adapters, or shims, or whatever has been utilized in scope mounting on airforce rifles. Thanks for your help!