For the DB meter, try searching for a free app for your phone. You'll be surprised what's out there for free. I have a paid one just cause I need it in my daily work. That mount has a lot of pros and cons it seems. Holding zero for you well I take it? No issues?
Those look a little short but then again pics can skew things off a bit. Never know until you try I always say....Here's what I did to shim the clamps...used the aluminum can pieces and just folded how much I needed per side for thickness. 3x for the rear left, and 1 layer for the front right. Cut little slots for the screw to go thru still. Looks good via my bare eye but won't know really till I test it...letting the loctite dry though...I need more patience...lol
The problem is not elevation as that is fine. The problem is Horizontal (windage). I do have the scope shimmed a hair for elevation on the rear ring bottom. I just added about 2mm to the front right rail and about 1mm to the rear left rail. Now I'm hitting the bullseye. Almost everytime w minimum scope adjustment. Weird....looks funny w the beer can pieces sticking out but whatever works....I'm only sighting in the scope from 15 yards.