This is a interesting army, but has a lot of flaws. Why even bother with a Hive Tyrant with all genestealers, instead I would use a warrior brood for a HQ and you can still add a venom to one of them, also I have to agree with the Hive Custodian about the W-O-N heavy choice, you would be better with gaunts or hormes for the swarm factor. You could also make a brood of 12 genes instead of 2 seperate with 6 and take a termagaunt brood for cannon fodder to help the genestealers make it to the frontline. Hope this helps.