The goggles are a neutral brand so anything can roll on that. I'd try for damage up or swim speed up. Damage up helps chargers even with the nerf and swim speed is great on everything. Although, as previously mentioned, its primary perk doesn't really help you (bomb range doesn't affect sprinkler). It would be ok for a vanilla splatterscope though.
The boots are tentatek so they will naturally tend to roll ink recovery up, which is really useful for chargers.
For a shirt, part-time pirate
is really good as it gives you damage up and naturally rolls ink recovery. Ink Saver main is also helpful as it helps you get another shot off, but not as good as ink recovery for chargers since you'll usually be in a spot to recover ink.
Quick super jump
might help because it offsets the slowed jump speed of stealth jump. Otherwise it isn't too useful outside of gimmick builds.
tl:dr: damage up and ink recovery up are really helpful for chargers. Swim speed is helpful for everyone.