Are you following a plan? If so I’d put a HM in towards the end of your next rest week, otherwise do it when you’re next rested. If not, you’ve had a couple of rest days, as long as you’re feeling good then have a go tomorrow?
My power profile is skewed towards the anaerobic side like you, and I find very good consistency between HM and FF. I think the trick with HM is to follow the instructions to the letter, especially on the lead in sections towards the ramp and constrained effort so that it can correctly do the calculations for the heart rate section.