It look like it would work now.
I have had this idex setup about 6month now and i am printed quite lot whitout problem. This print is printed only one material so only one (u or x) motor is used. Both axis have same kind and tall wiring. I check board with thermocraphy cameras after this print so we see how much those driver warm up.
Maybe i could also try to place u-axis motor to another driver before i start to change that motor.