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HQ
7 CCS pw, vox, astropath, fleet master, HWT lascannon - 145
Troops
platoon
5 PCS 4 meltagun // Vendetta
x3 Infantry HWT lascannon, flamer (sniper? GL?)
6 SWS 1 demolition, 2 flamer - 65 // Vendetta
6 SWS 1 demolition, 2 flamer - 65 // Vendetta
10 Veterans 3 melta Chimera - 155
10 Veterans 3 plasmagun Chimera - 170
Fast Attack
1 Vendetta - 130
1 Vendetta - 130
1 Vendetta - 130
Fortification
Aegis Line + Quad Gun 100
Inquisition
Ordo Hereticus Inq pa, pw, psyocculum, magic, 2 servoskull - 104

I need HWT lascannons in platoon but lascannons + quad gun bad combo

You've got a bevvy of Lascannons on the vendettas so I don't see the need for them in the CCS and infantry squads (you've got 22 in this list).
The job of anything not in vendettas is a) survive the first turn, b) take out opposing Quadgun. Personally I'd swap them for Autocannons, and add a vox to the infantry squad (are you combining them?) as I think they only work in pairs? I'd also ponder swapping the melta's in the vet squad for plasma (again, due to 18 TL Lascannons elsewhere).

Just my opinion.

a) survive the first turn

Platoon with magic in aegis will do. And Veterans on Chimeras will distract attention from them.

b) take out opposing Quadgun.

Hm... Maybe exchange SWS to some artillery and shoot at enemy Quad Gun? But I don't think everyone have Aegis and dont think quad gun is reliable against Valkyrie/Vendetta 12 armor.

Personally I'd swap them for Autocannons

No no, autocannon worse anti-armor and can't kill ap3 ap2 dudes
But I decided to take autocannon in CCS to combine it with quad gun.

and add a vox to the infantry squad

I forgot to write down. Theyre have vox

I'd also ponder swapping the melta's in the vet squad for plasma

I don't have points for that, can only put 2 plasma.