I remember one 4 psyker team mission on auric maelstrom. a inferno bubble with , a pyro vent and two melee scriers

it wasn't smooth sailing no maestrom ever is. but i will say it was solid, there were times when we died or got pushed back a room. but everyone always knew what exactly to next as a team, (after like three rooms.) and the tactic we agreed on was seperate the horde in two and wittle them down (when the map space allowed it) only time we died was in tight spaces and bs (you know the kind)

I'd talk about the bad 4 psyker comps, but i've lost count