So I took my RPR 6.5 creedmoor (w/ vortex viper pst 4-16x50 ffp) out for the first time today to zero at 100meters. I zero'd well with hornady 140gr factory loads. However when I went to set the zero stop i noticed I had to use basically all the shims to stop the windage at zero. Also the index line for zero reference lines were on like 3 instead of 0. I was reading that this might be related to scope mounting and not having any cant with like a 20moa rail. I currently have vortex precision machine rings on the rifle, however I have an american defense manufacturing quick release mount with 20moa cant in my parts bin. Would this be worth swaping to the 20moa qd mount/would it rectify the zeroing issue with the shims and reference lines? Would the ADM mount be solid and secure enough for a precision rifle setup?