Perhaps slowing the shimmer effect down, and decreasing the multiplier of "magnification" would be better for land plants? Sort of like a cloudy day versus an overly sunny one.
No clue, just throwing an idea out there. I do, however, like to think that plants might enjoy a flat out sprint for relatively short bursts, then a jog/walk afterwards. It's an interesting idea that might lead to higher gram/kWh ratios.