Where is the fountain of knowledge for learning about CNC setups / understanding them

[A_Camera]

is changing K3 to K1 what you mean Doddy to set the micro stepping?

K1 and K2 is the microstepping. K3 and K4 is the holding current. SW1 - SW3 are the motor current settings. As it is configured in the picture, it is set to 1/8 micro stepping, 50% holding current and 2.5A motor current. Micro stepping means that the total number of steps per rotation (most steppers 200) must be multiplied by the number set by K1 and K2, in your case 8. It means that the driver must receive 8 times as many step pulses as without micro stepping, so 1600 pulses needed for a full 360 degree rotation. It will simply take smaller steps.

all three axis jar at least twice and not always in the same area

I guess you mean "jam"...

Can it be that what you call jam is actually stalling caused by too high speed or acceleration for your machine? Or maybe something mechanical, misalignment for example. Disconnect the motors and try to turn all axes by hand. Is it easy all the way? If not then start with fixing all the mechanical issues first. All screws must rotate pretty easily and most of all, smoothly all the way from one end to the other. If the linear guides are misaligned or twisted then you will have problems, even if you may be able to force your way through using more current.