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You are certainly correct, except for one thing, AEG buckings really suck.
Heavier BBs put more resistance on the piston going forward, and that leaves one easy place for air to escape, the bucking.
This is pretty much impossible to fix unless you go HPA or weight your piston as much as possible, and even then it is difficult to fix.

VSR-10 bucking lips on the other hand are thicker and much longer than AEG ones so they have the ability to seal much better, and they are usually backed by the chamber making it impossible for them to get pushed out of the way, which can happen with AEG buckings.
Also, AEGs and HPA engines don't have nearly as much loading force as a springer or most GBB guns, so they can't drive the nozzle as far into the bucking or into a tight bucking as well, making that air seal issue even worse.
Definitely look at weighting your piston somehow or getting an aluminum one, and try putting a thin layer of super glue around the lips of your bucking so it is tighter in the nozzle, and also look at trying a different nozzle and boosting the power of the spring on your tappet plate.
This should all help with you gaining lost power with heavy BBs, making your gun about the same as 1Tonne's numbers.
Give or take a bit of course due to air seal, piston friction, cylinder volume, barrel diameter, bucking type, chamber, and numerous other things, but it will definitely help you out.
 

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You can still have great FPS consistency even with an air leak, as long as the leak is pretty constant.
I guarantee that you do have an air loss, but it is probably better than most.

This could have to do with a few things, spring age, spring rating, spring quality, spring brand, and piston stuff.
I know for a fact that cylinder/barrel stuff is not linear and neither is piston weight/friction, so you probably have a little bit of that going on as well as your spring being different.
It's near impossible to duplicate a spring let alone years apart from the first one, so that definitely doesn't help with this since that can be a huge variable if you are getting weird readings.

Anyways, 1Tonnes stuff is obviously not perfect due to all the variables out there which simply can't be accounted for, but it's a great guideline for someone to begin with, and they can go farther with it if they so choose to dial everything in exactly.
 
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