You are porbably on an M100 spring, in which case your FPS / air seals are all very good
I was going to say, but held my tongue... dont get hung up on measuring amp/current, unless you have very expensive test kit - as you have found - it does not show peak draw all that well etc
The best test for basic kit is just do a sustained full auto burst (3 secs) and get the constant/settled amp draw.
The amp draw you are reading is showing you power consumed, this is affected mostly by higher or lower effort required to turn over/cycle the gearbox.
A more poweful spring, binding/tight shimming, sticky piston, gear meshing, etc, will all increase effort.
There are so many variables, but get a base reading.
Your gears should have a very small amount of vertical play, clearance for lube and a tiny amount of heat expansion. Talking a 3 thou 0.003" or 0.75mm.
Provided your motor height is in the ball park, you may find you can perfect it by doing the basic amp draw test above, adjust the height like 1/8 turn, re-test etc to get the lowest reading.
You should not be more than 1/4 turn either way than your start point really if mesh is set correctly.
You can use your base reading against lots of little tweaks - shimming / piston rails / gear setup etc
PS make sure your battery is always in the same state of charge for apples to apples test results!