Personally, I think bruisers is currently well balanced.
Before the cd shared update, It was hard to difference an experienced bruiser from a beginner bruiser, because both used to aim aimlessly and it wasn't (almost none) skill required. Besides, In the situation the bruiser was in doubt in each opponent passer should be bruiser, the bruiser could simply bruise two with the 2 abilities in a space of a couple seconds. Now, they need to actually have a strategy in who actually to bruise, because bruiser now has only one (two in case misses and don't hit no one) chances.
Right now, the bruiser requires more strategic, I understand that it's frustrating to wait until the cd resets. But it was way too overpowered before.
I believe one way to balance the bruiser could be affect the quabble, instead passing through the bruiser, the quabble could fall in the next second the quabble collides with the bruiser.
Even though, I would like this idea and could be fun rest the cd instead of hitting the bruiser's ball, I believe there is bigger problems in quabbleball, for example, the defender vs passer situations.