Attached is a text file with some data I dumped a while back, when I started looking at focus.
Never worked it hard, but if you want to give it a shot, let me know what you think my backlash is
I generated this data by modifying the code a little to get the focuser in an infinite loop, starting 100 steps below the focus point,
going up by 10 steps twenty times, each time computing the HFR,
then reversing direction and going down by 10 steps twenty times, and repeating forever.
I was using my moonlight focuser, I don't remember where it was pointed, I probably still have the images.
Did about 7 passes through the data.
Re compiling kstars/ekos/indi, it's not hard if you're comfortable with that kind of thing.
The easiest way to get started is to run one of Rob's (rlancaste) AstroPi scripts
see
indilib.org/forum/general/5524-astropi3-...revised.html?start=0
depending on your target platform (or just read the script and run the commands manually).
Feel free to ask if you have any questions.
Hy