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You'd see more Sisters melta spam if the army didn't break down to about $1 per point, with half the line out of production. The models and units are reasonably balanced for an army that hasn't been rebooted in years, but the lack of formations and associated bonuses limits their ability to go toe-to-toe with top tier armies.

You can take multiple IG detachments to spam CCS's with 4 meltas each and they can issue orders to themselves to become TL, MH/TH, or ignores cover. You can fill the troops choices in the detachments with vet squads. Each vet squad can take 2 meltas and a missile launcher.

Ork mek (big) guns is what you need.

BS3
18 pts per gun with 2 grots

Also, it meets your requirement of being GEQ. Grot Equal.

And you can easilly proxy it with 3-d party guns. Even lego guns. You just need a lot of grots.