Yeah, you are. I'd drop the Carnifexes since they are likely to be tarpitted, being units of the ground as well as not being able to do much damage to Bikes.
I would also look into a Mawloc with AG, the Large Blast S6 AP2 will really help against the Bikes and hordes, while the AG helps against Dark Eldar Vehicles. Since he can pop up anywhere, you can dictacte his deployment so that he runs right into your Hive Tyrants.
I'd look into a unit of Gargoyles to screen your Monstrous Creatures should they get grounded.
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