I would nerf the Dynamo Roller. It is such an obnoxious weapon when lag is involved. Sure, every weapon's deadliness is multiplied when there is lag, but nofin like the Dynamo Roller (and the E-Liters, I will give you that). Also, fixing the Inkzooka's hitboxes would be great as well. I don't care if the hitboxes are fine and the actual problem is lag. Lag is in the game to stay, so it is better fo adapt problematic weapons so they won't be stupidly good under the influence of lag.
@Award; I actually think the Bamboozler is great for any of the modes. I ended with >1000p multiple times in Turf Wars, it splats ridiculously easy with is always a good thing, especially in ranked and again, it can cover turf well for a weapon that is clearly focused on splatting opponents. I would rank it usefulness in the four modes as: Rainmaker > Tower Control > Splat Zones > Turf Wars. I am speaking mostly about the MK II variation btw, can't really make the MK I work.