You know the trap you have fallen in to hear is one I often fall in too... You have made your assault unit to powerful! Seth, Chaplin and 10 death company with toys will
spank most units in a single turn. This leaves them stood out in the open probably on the wrong side of the battle field with 800 - 900 points of pissed of xenos scum all
around them and about to be shot to bits!
I have been running death company with out a chaplin for a while now. The are still mega now that rage has taken a buff in 6th. Have you thought about taking no
transports and just running accross the battle field? Take Seth or a Reculsiarch as your HQ and spend the rest of your points of 4 or 5 squads of death company each
with a single power fist and a couple of death company dreads! Very Angry marines!
As a note do not try this against any one mega shooty. My brother just got his new Tau Codex... Sigh.