There is certainly a learning curve to ERG mode. I jumped in 5 years ago and it was interesting and frustrating at the same time. Some was the limitation of the trainer (CycleOps Powerbeam Pro, wheel-on) that was slower to react to wattage and cadence changes.
Unintentionally, those limits taught me just how important that my own cadence control was the largest factor in the equation. As a result, I made cadence my primary focus and learned to ignore power. That one tip is the key I continue to stress, even when I got to better trainers. Smooth and steady cadence still makes the experience better with more responsive equipment.
With your H2, you have one of the best ones available (I love mine) and can take advantage of the best that ERG can provide. Happy training 