Erg mode beginner

I’ve recently started using an H3, and while I love it, I found some interesting quirks on today’s VO2 Max effort. I can appreciate that there’s going to be a bit of a lag between spin up and spin down, but there were a few efforts where the trainer took close to +/- 10 seconds to adapt (usually following the hard effort). This didn’t happen every time (just enough to make things interesting), and I couldn’t figure out any specific pattern.

My approach is to ramp up my cadence over 100 about 5 seconds before the interval starts, and this generally worked well.

The other thing I’ve found is that, regardless of ERG mode, the large flywheel on the H3 really makes riding at low power (60-90 watts) incredibly difficult… I feel like I’m free spinning and actually find I engage muscles trying to actively control the spin (when I should be recovering) - anyone else find this to be the case when riding on a wheel-off trainer?