Hey there Bungie,
I wouldn't be surprised if you are aware already but the molten overload mod is not working at the moment. I play hunter with thermite grenades right now but they aren't stunning champs. I thought it might be a problem with thermite being non-native to hunter so I swapped to swarm 'nades. No cigar.
Anyway thought I'd bring it up because I didn't see a post already. I hope you folks are having an amazing TWABerday
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Overloads are only stunned by grenade impact, nothing else. Been that way since champions came out so Bungie is saying that it's fully meant to be that way.