First, split those action monkeys (aka Mandrakes) into two squads of 5.
You'll have more chances to do actions, snag objectives, etc. Position them off to your flanks in preparation for drawing secondaries that want squads in different locations - like Containment, Investigate signals, etc Keep them out of site if possible. Bounce them up/down as needed. If they never fire a shot but score you some points? That's just fine.
You know how you keep your fragile Ravager gunboat from being blown away T1?
Don't have it on the board.
Keep it in reserve. See where it's needed & bring it in T2/T3 to get
Los on that spot. Combine it's fire power with that Razorwing
Same with the Scourges. Keep them in reserve, bring them in, & add their lances to whatever the Ravager + Razorwing are targeting.
The goal is to make the target
GO AWAY. There's no such thing as overkill when you're shooting up Vhal & friends.
also, remember to make use of the scourges move after shoot ability. And arm the leader with a Blast Pistol.
I'm biased. I don't like Wracks. I don't like their models & I hate the mishmash of weapons.
I would drop these guys + Urien in favor of something more dangerous.
My choices would be A) another unit of Scourges, or B) another Talos + a Cronos (ok, not the most dangerous thing
atm, but it is another pile of T7/w7/3+6++FNP5+ coming at the foe. + it has a useful Pain gimmick)
And when you switch to Real space Raiders you'll probably want to ditch the Wracks or Urien in favor of a Succubus anyways - because you need someone to carry
The Art of Pain enhancement. And the Succubus is the cheapest option. Her job is NOT to go kill things. It's to remain alive
on the board (not in a transport) as long as possible to generate those pain tokens. If she gets a chance to hold a home objective, do an action, etc? Bonus! Also, give her a Blast Pistol - just in case.
Question: Are you making use of the Grenade & Tank shock strats?
If a unit has the option to take a Phantasm Grenade Launcher? Take it.
Don't be afraid to use your Raiders & that Venom as battering rams.

a Venom isn't the strongest thing, but sometimes all it takes is another
MW or two to tilt a fight.