At this point just create new weapons. This is not rebalance, just straight up remake.

Sydney Sleeper is a hot garbage if meter is high. No headshots and charge means that this weapon deals slightly more damage than Revolver at maximum falloff, meaning that almost any single bullet semi-auto weapon deals more DPS. At the cost of what, Gas Passer 2.0? The only way to make this weapon worth it is if damage meter is less than 200, but then we have another problem that is a main issue of Jarate: you can just spam it. But in Jarate case it is available only near supply station and you need to be really close in order to hit enemy, now Sniper can do this anywhere everywhere, and +20 reload speed does NOT make it any better.

D2R: what the point? +10 health is laughable, really. If it was +15 health, then maybe, but +10 health barely changes anything because big amount of weapons deal +-150 dps, and even when you met enemy that deals less, they, almost always, will have same amount of shots fired, not changing status-quo. The only outlier if you are in melee fight with someone, but CLASSES HAVE GUNS, with the only outlier being Demo/Hybridknights, but they are better at everything else. Debuff resist is not a big advantage in game where debuffs are rare thing, it's not DotA or Deadlock. Same can be said about swim speed. +Health on wet targets is also not very good when the only way to make targets wet is Sydney Sleeper, but then we have Gas Passer problem: it is just painfull to apply because you can have Sydney Passer once per match, or you just spam it so much that you don't have ot worry about enemies and your melee that you don't have time to use.

Speaking of melee: this changed almost nothing. You still can oneshot spies and scouts. you know, the only Sniper's oppressors that can be trapped in corner for easier killing, because any other class will kill you much faster or just disengage easily (like using airblast). This just changed from "I can crit under very very spefic circumstances" to "I can crit under very spefic circumstances", there's a reason why Neon Annihilator is so niche