So my idea is that you get a group of 7+1 Warp Spiders and an autarch with a fusion gun and jump pack. Deep strike the autarch behind a transport as well as the warp spiders and use the autarch to crack the tank and the spiders to clean up the disembarking troops. I n the assault phase try and move the spiders and the autarch into coherency of each other so your hq cant be picked off easily. rinse and repeat with the next transport or unit followed up by assaulting them. I know there is some refinement needed but this it a thought I had. Let me know what you think :)

EDIT: Doh, ok looks like we can't have an independant character join back up with a unit during the assault phase as per page 48 of the rule book. Good catch Andrew =D (less info)