Im having trouble getting the gain settings correct in my advanced flight 5600 efis. The altitude hold function is way too agressive. I have had the gain from .04 to 5.0 all with no help.
I have the same issue connected to my Dynon10A. I bought the EZ-3 used but the other install was on a RV6 & he no problems. Not sure what efis he had.
I hope connecting to the GRT Sport SX later this week will correct it.