Barrel length also plays a large role in how quiet a gun can be. My baby barret, m4gery, and sr722 all have barrels longer than 21" and are very tolerable with standard velocity ammo without using a can.

On the other hand, my 22lr builds with 1.5-4" barrels are some of the loudest pistols I've fired.

CCI quiet "semi auto" ammo helps a ton too, even with the shorter barrels. Aguilla sniper subsonic is really nice just harder to find and some guns don't cycle it well.

I’ve heard good things about the pill popper v2

No experience with .22lr cans, but for my 9mm, the quietest reading I've gotten is with the hubtn.4, he has a .22lr version, but again I have not tested it, might be worth to try it out though

I don't know if it's the quietest, but I was really impressed when I heard this z-baffle design: https://guncadindex.com/detail/Silencers-22cal:b Performance was comparable to my purchased Diligent Defense Road Hunter.

How much of the noise is from port pop and muzzle blast versus the action sounds? The bolt slamming home on my 10/22 is obnoxiously loud and I wear earplugs even while shooting that suppressed. I tend to prefer shooting repeater and single shot firearms suppressed. Don't get me wrong, I'll suppress every firearm I can, but repeaters are a lot quieter than self loaders.

Cci quiets will do the trick. Were you running subsonic 22lr? 950 is awful fast for a subsonic 22lr.

Ftn is going to be the most effective long term solution. Plaboi was an absolute genius with his designs. Especially if you print with reinforced nylon and use cf or aluminum tubing for reinforcement