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At this point in time the lcd controls are not always accurate for movement, they don’t always obey firmware speed and accel limits, you should always test with gcode.
Again, use very conservative speeds for travel, testing at max speed isn’t going to give you valuable information.
You have an extremely long z axis, most of this could be coming from that.
I feel at this point you are changing to many things at once and are going to frustrate yourself. Only 1 variable should be changed at a time.
What speeds were you using for the initial test that were pretty close? What software did you use to generate your g code?