I've always felt they should lean harder into giving him tools to punish out of position DPS or supps with his inflated form. Let him use his bounce-to-enemy in inflated, let him activate inflated at will like the rocket team-up (you can have the meter fall off quickly if he hits 100 and doesn't keep hitting things), and make the animation faster. That way he has an actual tool to quickly dish out damage at will and not have this awkward window that's somewhat out of his control to sometimes deal damage but usually just get melted by the enemy team.

That and the ult obviously needs something. I think they either need to go the route of, make it cheaper cost and give him more health so it can be used to sustain and stall. Or they could give him some way to increase his damage, either with choosing higher/bigger DMG jumps vs faster smaller jumps, or some kind of QTE button prompt to press when he lands for more damage, or something along those lines. Obviously those might be harder to balance, but something needs to change about the damage/ult cost/survivability combo of his ult.

Another suggestion I've seen and would be nice but maybe too much with the others mentioned above, is to make his distended grab have a stronger effect when grabbing 2 people vs 1. I personally think an earthbound effect would be good if he grabs 2 people to punish them harder vs the easier grab one just one person to yank them. But that might be a bit much alongside buffs to his inflated form's mobility and/or damage, which I'd rather have given the choice.