You can get the +/- .05, .10, and .20 inserts for 1" rings.
The 30mm rings only have +/- .10 avaialable.
When I used the .10s in my 30mm set, I gained 19 MOA. That was with DD bases, on a short 700.
With the 1" Zee Signature I gained 36 moa using the .20's fore/aft. That is on a pic style base on a 10/22, with ring spacing of approx 3.5", or 10 slots on the rail.
Aren't those .005, .01, and .02?
Anyway, here's your example. With .02" offset fore and aft we have .04" vertical offset, spread over 3.5" of ring spacing.
arctan(.04/3.5)
~ .6548 degrees
1 minute of angle = 1/60 degree
~ .0167 degrees
So we have (.6548 degrees)/(.0167 degrees per minute)
~ 39.2 minutes
I did a quick look and I think c-t-c Picatinny spacing is .394", so ten slots comes to 3.94". Using this figure instead of 3.5 gives us
arctan(.04/3.94)
~ .5817
.5817/.0167
~ 34.8 minutes, which is closer to what you observed
