I'm in much the same place. I have won 1 game in the last year
My bikes don't seem to last long, hence the dark shroud, but Sammael has done well for me in the past, but I almost never used him in the old codex due to how much cheaper belial was.
I use the bikes as anti infantry, leaving tanks to my thunder hammer and chain fist termies, and to attack bikes with
MMs. I load them up with plasma and send them after light infantry and light tanks, leaving
TEQ and
av 13/14 to the termies.
I don't like to use Azzy because he needs an escort, which means a land raider and a big change to the force.