Lorna, I was testing Spitz’s macro and had the same experience, regrowth not casting. Additionally, GSE was giving me an error on the [mod=crtl] line in the keypress section. I updated that to [mod:crtl] and regrowth started working.
As for the dps, I was pulling approx 7.5k with no coooldowns, at ilvl 350. I still have a few crappy pieces so I am going to give it some time for the true testing.