Hi Paul,
I also have a C11 (with Starizona Microtouch focuser on stock focus knob). Using the provided instructions I ended up with a 250 step size (Compensation = IN) which worked ok but not perfect. Based on (gratefully appreciated) feedback from others here, I have been increasing this to larger amounts (from 800 to currently 1200). This has improved things - I think the focus point ends up being quite good almost all of the time. I occasionally still get an out-of-line point at the far left or right of the graph, so probably something else going on there.
Here is an earlier thread with more info:
Overall, I’m impressed that it works this well, considering the mirror shift issue of an SCT.
DaveNL