If you have trouble maintaining speed with the Autothrust ON, just push the levers slightly out of the CLB gate, and you will get an increase of power towards the MCT setting. When you have your speed back under control, bring the levers back to the CLB gate.
There is a mentality that the A320 and its FBW bretheren will get you out of trouble, no matter what, you know its made for spear throwers etc.. But its still an aeroplane, and can bite back, it will stall if mother nature chucks its' worse at you. Ever been at 390, made it to the altitude just, perhaps a little early, then it gets turbulent. Like sitting on a knifes edge, no matter what the manuals say
