Thank you Guilherme, and I think one of the main things in any horse is that all youngsters first have to relearn their balance when they have the added pounds of a rider on their back.
You summed it up quite well in the fact all horses have a range to the speed of their gait. You cannot expect a Rocky (and yes I know their are exceptions) to have the speed of a racking horse which is bred primarily for speed with distance.
The main thing to remember in gaiting is condition, condition, condition.
A woman can NEVER have too many horses.....