Electivire was actually the first thing I thought of in your team, but I guess I actually forgot to mention it (or maybe I did a few posts ago and never followed up on it). Low Kick will hit Mamoswine harder, just so you know. Adamant Electivire will have high chance to OHKO, while Jolly will have a low chance to OHKO. (EDIT: that's with Expert Belt)
You're right in EQ not being that good for you team though, no immunity on that, etc.
Latis does resist electric though, but yes, they still get paralyzed and don't have fire move and are special.