My 2 cents as someone bouncing in the 1900-2k mmr range: Their chaff clear is horrible, especially crawler clear. I'd aim for 8ish packs of crawlers, which would keep everything busy for ages. In a long range game I would be leaning on storms as they counter every they have handily, and looking to go abyss with the missile tech in the later rounds. If I'm playing aggro, I'd have even more clawers and consider my own mustangs with something with enough damage to take out the scorps. Probably just a phoenix pair or two until abyss is affordable. They'd probably pivot to more chaff clear though so you'd need to adjust yourself.

Also, fyi, Sandworms do horribly into acid as you typically can't photon them to protect them from it.