I have been using the T8-2 single start lead screw now for 2 year on both my machines.

I have recently flashed the 2.06 marlin firmware, the funny thing is that when I print "Flexi Turtle Ear Saver" one machine works the other does not.

I may have to adjust my firmware.

#define DEFAULT_AXIS_STEPS_PER_UNIT { 80, 80, 1600, 94.4962144 }

Could you post you model, would like to try you model.