I've tried upgrading every monkey I could think of and none of them can deal with the Camo Leads. Not sure how the player is meant to deal with those.
Also, the current implementation of the "SMUT" tower makes it a waste of money. It costs a huge amount of money to invest in buying/upgrading it while never paying itself off. It either needs to generate more money per tick, or do something else like increase end-of-round profits or per-balloon money earned.