All I can tell ya man, is that the more I shoot springers, the more and more I realize that a few extra FPS or FPE make absolutely no difference in the world in anything. But getting your springer to shoot smoother, quicker, more consistently and with less hold sensitivity will not only put a big ole' smile on your face every shot, but will hit the intended target with much more accuracy and precision every time and it will do it consistently. This leads to you doing your best work on paper and getting that satisfaction when you drop your quarry cleanly on hunts with almost every shot because the pellet hit where you aimed and intended for it to hit.
And another big plus is that once you get your stock screws snug and tuned in place and your scope mounts together and snug, every thing will STAY exactly the way you put it. You won't have to fiddle with your rifle every day, waste a half tin of pellets trying to re-sight the rifle in or get the mysterious POI shift back on target, etc...etc...all in all, about 80% less fiddling. Just sight in, snug things tight and your done until YOU decide to change the POI or change the scope or whatever!
And even if you had to drop your velocity and energy 25% to do this, when you recover your quarry, you'll see that most of your shots will still be complete pass-throughs.....meaning that those FPS or FPE that you dropped with the tune were totally useless to start with!
Velocity and power are so incredibly overrated that it's ridiculous. Unless you can harness all that velocity and power in a PCP, where you can still shoot smooth and recoilless and hit your target every time(but in most cases, unless your hunting foxes, coons or large jacks at 80yrds, that extra power isn't needed and just results in passthroughs and wasted extra velocity and energy), be willing to give up some of the velocity and power in a springer/gas ram and you'll find airgun zen and know exactly what I'm talking about.
My most effective killer in my arsenal is a .177 caliber 10.8 FPE springer that will shoot under 1.5" groups at 100 yrds at a bench rest and put a pellet through a cottontail's eye at 50 yrds almost every time. I'll get misses on quarry here and there with all my other, more powerful rifles in the field, but not this one.....