Marty,
"I dont know if the max pitch limit is the same in gps and atti but think most likely it is."
You are suggesting that the max GROUND speed in GPS mode is set regardless of the wind....which would require a different, greater pitch if fighting a headwind. Interesting suggestion. It would make sense,,,when designing for ease of flying...to do that and still give one some security against having the bird blown away by a 20 mph gust. I can't answer that, but I will say that if flying fast in GPS...one shifts into Atti.....there is an instantaneous increase in tilt forward...and speed. THAT does not suggest or prove that the maximum potential pitch in GPS and ATTI is the same....or different.