This should work very well. About three grenades will clear the whole radius from them dragoons. If they are not too spread out, that should clear most of them 45 guys in 6-9-12 grenades.
45 Dragoons are active at the same time in a wave. That's - not - the wave budget, though. So, you'll end up spamming lots and lots of Grenades. After a while, you will run out of them. So unless you're using an infinite grenade mod, you can't sustain your damage output for more than a couple of waves. The Dragoon mod is a work in progress, and I have added more variety in waves 3-11. Waves 1 and 2 are just goons, atm. No Husks, yet.