I would contact Frans in Australia for the correct metric settings.
Spindle delay was implemented to overcome the limiting size of the capacitors on the spindle main board. The slow rampup keeps things very reliable. No, it can't be changed.
Steppers work by having the current run throug both phases for holding power, thus generating heat. Heat is normal and they are good upto 180 degrees F. You are probably seeing 110-120, which is normal.
25khz is slowest, the higher the number the higher the plus speed, the faster the machine.
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