The problem I see is that you have two scoring units or - at best - four five-man combat squads as fragile scoring units in a game where objectives are key.

I would go with five tac squads instead of two tacs and three assaults. If you are going for the leaf blower, the extra attacks aren't going to make that much of a difference in cc against non-blob guard.

An alternative (though a pricey one), would be to go with Kantor instead of Lysander and make two of the assault squads sternguard. Again, you get (even) more attacks, you still get stubborn, and four to eight scoring units.