What experimental build? I’m using the lastest Unstable Master Branch Build (with custom autopilot).
I’m seeing 19.7% at 600ft MSL and 15°C.
Just did a few patterns at very low weight (100000lbs) and at idle the A320 didn’t move at all on its own.
Had to increase to ~22% to get it moving and when returning thrust to idle, tha speed stayed at 6kts.
Experimented by setting thrust to 24% and even in this case it took the A320 40sec to reach 25kts.
Looks realistic to me.