Yeah, lack of CP and objective securing units seems rough.
Also am not sure I'm fully sold on going Saim Hann just for the Vypers - and I play Saim Hann. You seem to be underusing the strengths of that trait.
Lack of assault with ITC ruin rules might also be problematic if your opponent can be holding objectives from inside them, pretty much would be the Warlocks or the Guardians to try to dislodge.
It does look nicely shooty, and ought to rip some good holes, but if you can't shoot your opponent off the board I see it being a struggle.