Tuskal just shreds most things. With karakei both monster die, I too do the switch thing snail and bug tank are fine but with karakei I have to switch too early he simply is not as tanky against poison so both die.
Skimander frontrow damage scales insanely with speed not as holistic as tuskal but I think it can be more powerfull.
With my skimander builds I usually killed myself in recent runs either to the switch debuff or leeches because his damage was so insane.