Inmo set bonus must grow with each attack, like buzz buzz, but time between waves <3 sec. That will erase bonus... Solved.
It might solve it, or it could make it all the more frightening lol. Once you're at the point where the bonus round isn't dying instantly, your attack speed will go through the roof since you're getting exponential attack speed growth (more attack speed results in more attack speed).
3 sec each 30 sec. Just for reset. Or stacking up to 300% like purple bandage (3% per lvl, but 1% per hit).
Personally I think a cap would just be fine, a decent cap to justify the set but without making them basically the entire deciding force on how good a tower is. Like 500% Damage (from Unrelenting) and 500% Attack Speed from the set. Substantial, but not the current ridiculousness. If nothing else, the set should be somewhat comparable to the Mummy set, 300% Attack speed, Arpen, stacking damage on the same target.
This is a set on a clean (no speed potion used) Jilly after 500 waves, didn't get all the seconds because sometimes I couldn't skip since my main insta killed everything.. Is this fast enough for you?