Yes, they can kill tanks...

So, between the Sternguard, Assault squads following on and the Death Company assaulting, I WAS able to  deal with an overload of Leman Russ class tanks.  Fortunately, there were not nearly enough Infantry to bog me down, and his fliers got stuck in reserve long enough for me to deal with his Punisher tanks.  Did have my Sternguard and CPT Tycho endure a turn of him unloading some 90+ shots into me, killing 4 of my lads.  And by soaking so much fire, the Death Company and DC DN were able to roll across the field and wreck lots of stuff, each accounting for a squadron of Russes...  So, I think the Army is tweaked enough.  Time to see what else I can field, maybe try a Dev Squad and the Storm Raven...