Does your controller recognise the G92 threading cycle? This one is a few more program lines than G76 but sometimes I find it easier to tweak final sizes.
The G92 line has the final Z coordinate, the X size for the first cut and the feed. You position your tool on the line above in the program. Following the G92 are all the Xs for cutting the thread.
An example with Z0.0 at the end of the thread is:
G00 X0.26 Z0.2
G92 X.24 Z-0.5 F0.05
X0.23
X0.22
X0.215
etc
X0.195 (would be about the final cut)
An open mind is a virtue...so long as all the common sense has not leaked out.