Of course they are beatable, but relative to other enemies of the same level they are significantly more difficult to defeat. As I said, beating enemies 10 levels above me is easier than beating large insectoids of my level. That's the opposite of balance.
My issue with them is not poison, but their lack of signs that they are about to attack when in close range, aside from preparing tail, which only endriagas do.
GMGM do not take in consideration aspects, like animations, attack range, attack speed, etc. It's based purely on damage and HP. Slow attack speed and obvious signature before attacks is why killing a cyclop or.golem 10 levels above is so easy, although time consuming.
I want to make insectoids easier, but I do not know in what way... Their HP and damage is similar to same level enemies, so that IS balanced, so maybe speed and range is what I should adjust.