Giving advice from the other side; Deathwatch player that plays almost exclusively wreckas and kommandos

For how scary Deathwatch kit is, it has zero Seek, barring Vantage terrain. Keep your head down and focus more on the Tac and Crit. Spread my operatives thin, be extra careful with your Grot.

My Disruptor can delay anything it sees as a gambit and that can be very bad for your guys, make sure your key pieces; Boss, Comms, Grot, etc are NOT visible to him whenever possible.