Hi,
I'm new to playing guard and have an event coming up, there's no stronghold assault, Knights, escalation, etc. even formations

and one or two others.
Since I can't run my scion formation, I have to use some guard. I could use Scions still, just without the benefits hurts.
Without stronghold assault I think air superiority will still be nice, so I thought of:
Lord Commissar (no upgrades, just for
ld boost of the
OOTF)
CCS, officer of the fleet, 4 plasmas
2x10 vets with 3 melta
2x10 vets with 3 flamer (waste of bs4, but in teams of 2 squads I can clear objectives)
2 chimera, 1
HF,
HF the other
HF,
MM with dozers and camo nets (to try and survive)
3 Valkyries with pods,
ML, and sponsons. (can't fire all weapons, but still helpful I find for anti eldar EQ air)
Vendetta (for anti air)
Do you think I'm better off with another detta, dropping a valk? I could restructure it into infantry platoons and save points, but don't know if I'm better off with special weapon squads holding those guns with 6 models.
Keen to hear thoughts. I have another chimera I could convert, 2 hell hounds, 10 ratlings, 10 more vets, 4 snipers, and
hq models.
Automatically Appended Next Post: I should add, it's a largish event - 150 players I think, to give an idea of the variety I'll face.