No problem, i'll answer the best i can.
I'm not sure if changing the z endstop fixes that, but shouldn't hurt to try it? Seems strange to me that z is moving so fast. On myp rinter, it's really slow when moving in Pronterface or in LCD controller. What is your speed setting in Pronterface?
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Thanks again.
Pronterface has speed settings? where would I find them?, I thought maybe it was the Step per mm, in the config h file?