Hi Bri,
I tried doing zones in place of regular reps for the middle section of 30-10-30 for a couple of sessions with cable bicep curls.
My feeling is that it is something worth exploring in the future alongside negative emphasised training , although not necessarily 30-10-30.
My reasoning is that there is a lot going on mentally during a 30-10-30 set and that adding something more complex than regular 1/2 reps for 10 reps is difficult to do consistently over time.
Maybe doing the zones at the start followed by a slow negative would be a better way to try it
I have also done sets with a static and a slow negative, which I have found a nice variant , albeit no more productive than any other protocol.
Mark