I have since upgraded to the meticulous Z-axis, but before that I went to what some might call extreme measures, but, had little trouble with my z-axis afterward.
I ended up changing to the meticulous z-axis for accuracy and speed and have been very pleased with it, but, still tinkering, and trying to improve!
I also designed a “router hat” which worked well for me.
But I also agree with David, sounds like too much tension.