I'm getting better at the SFN, I have a paltry 10~% success rate. Lol
Haven't fought Thargoids the last few weeks. But "firing it off" sounds like the problem. It has the "charging" display. You actually are immune to be disabled while the charging animation runs. If you release the trigger before the wave hits, you are unprotected when it hits.I'm often firing it off just before the wave hits, but nothing happens.