Out of all of these weapons, I can't help but to be worried about the Bamboozler 14.
According to its stats, it seems like it trumps both of the Squiffers in literally every single aspect.
And combining a Splash Wall with a charger that goes to its maximum power even faster than that Squiffer sounds extremely scary, possibly to the point of it being broken.
Honestly, if I want to consider this weapon viable, but to the point of it not being deemed Overpowered, only make it deal around 95.0 damage on a fully charged shot. That way, it'll require players to make use of Damage Up equips if they want to reach that 100.0 damage for a One Hit Splat, but that can obviously be counteracted by other players with Defence Up equips.
And before people complain because you can't actually make Damage Up's go above a certain damage cap (an example is the Aerospray's damage being capped to 24.9 to prevent 4HKO's), that notably only applies to Shooters right now. Maybe even Splatlings, but definitely Shooters.