most stats I've seen so far are extremely powerful, or overdo the change. Imo it's important to go with what the weapon has already
I think since the weapon clock changes with every pill fired, that should affect it somehow. Could involve something like it starts with higher base damage, but the damage is lowered each shot. However, that would make it annoying to other people. I like the idea of changing fuse time. Could be interesting to make One shot in the clip be similar to normal, one fires like loch, and one fires like iron bomber, making it ideal in multiple situations.
Ignoring the changes above, I would probably set the stats to something like this.
-10% base damage
Damage increases based on how long pills have been on the ground, making rollers more effective. Could also be swapped for how many bounces the pills have, ie: each bounce deals 2.5% more base damage. This would make it so it's not an insane amount, but you could roll one directly for a large aoe style.
+15% projectile speed
-20% arc on bounces
No change to clip size, as the already mentioned change based on firing multiple pills visually affects the weapon, no need to add more work to the creator.