I like both of these. The energy pistol being unique is a good idea instead of just making it function too similar to an energy-pistol variant of cooked shot blob pistol attacks. Since it's a unique weapon it's far less of an issue. I would personally make the aoe-blast a special attack, and give it like a 5 turn cooldown that eats a ton of energy but, that's just me.
If we compare the Toxic Blob Pistol to other blob pistols, I think it'd be good to make the main on-hit effect of 1 stack of Contaminate be a 100% chance just like Cryoliquid Pistol's 100% chance to add a chill stack per hit. The Incendiary Blob Pistol's 40% chance to ignite also fears the majority of living enemies when it procs, so the chance (as a disable effect) makes more sense there. 18-30(x2) split damage is a bit high compared to other Blob Pistols. I'd put it to like, 15-22(x2) even split of mechanical/bio.