Pre-15 Artanis P1 on Brutal+ DoN?

I'm having a hard time defending against Kaboomer/Choker + lots of Aberration after night 2 when we need to cover all entrances. Spinlot + Storm don't burst them down fast enough and if my ally isn't a defense God like Karax/Swann to cover me we tend to get overrun. I'm forced to mix up HTs with Immortals to counter armored but the gas cost is just too much. That's why Swann is the best ally so far with his gas drones.

Anything else that I should try out or is Artanis P1 just weak on this map?

EDIT - much better results with Gateway/Cannon walls and Goon/Immo/Reaver composition, with very few Zealots to tank. I may try mixing in some HTs next. Thanks for all the tips, everyone.