Scuttlebots aren't dangerous enough mobs. Having some cupcake mobs laying around in tier 1 is fine, but for tier 3, at least, they really should be stronger. One way to do this would be to extend their range, so that they're not practically melee mobs. Another alternative would be to increase their firing rate, so that they only have perhaps 2/3 as long of a recharge as they do now.
I always found Scuttlebots to me more of an annoyance enemy than something that's supposed to be an actual challenge. Most of the T3 ones I find in conjunction with enemies that already need some concentration to defeat (Retrodes, Gun Puppies, Greavers, Mecha Knights, etc). They take a lot of hits as well so its not that you can easily just bat them aside while you deal with the next Kat.