I feel like something like a Damaged Mitigation stim would make more sense [could tie to Psyker warp generation/venting speed instead of the Combat stim one, and the combat stim getting warp charge speed + damage instead of cost].
Something to pop on your Ogryn or Zealot when a boss shows up to help tank it.
I mean the mini-heal is an interesting take, curious how it’ll feel/balance the game, but I think I’m stillbiased from VT2 potions XD
med stim is a good addition imo, i’ve enjoyed having it so far. if you’re sloppy in your early game it allows you to get back on track whilst saving the med station for someone else who mightve needed it as you came upon it.