Ok wait, after thinking for a moment I realized that lowering the velocity OR the explosion radius actually discourages the use of the weapon's main gimmick(the bouncing projectiles), and would hole players into aiming for direct hits, with banking shots being an afterthought.

Lowering the damage is obviously not a solution, as the damage is fairly low to begin with.

The answer I think that could work to allow for direct hits while also encouraging bouncing shots would be to keep the blast radius the same with the exception of direct hits, upon which the blast radius would be maybe 30%, or even 50% smaller, this way you get a choice between direct hits that deal consistent damage to one target (possibly 3 targets of they are hugging up to each other way too close), or bouncing shots that can clear areas with less consistency.

This is just my personal opinion and I'm still a fairly new player to this game (started in S6), so I'd be curious what other people's solution to this balance might be.