First build :i'm not a fan of the shadow Wolf ,whatever range you use it the ennemy will be out range of the firefly.(the fractured basalte annihilator is better than basalte dissolver)
Second build : same as for the first and i also recommend you massive shocker feet.(the broken blizzard annihilator is better than blizzard dissolver)
Third build :i think the combo lighning recoiler,piercing Fox and unstable cell are not good but i haven't enougt experience to comfirm it to you.Same as the second massive shocker feet are better