Hi there,
A while ago, perhaps almost two years ago, I modified the LVBTracker firmware in my Fox Delta ST2-USB so that it would allow for more calibration points than just the min and max for azimuth. I had added a remote-control option to an old Yaesu G-450XL, but the output voltage was very non-linear, which led to terrible aiming of the antennas. With the mods I made to the firmware it now allows me to calibrate the controller at 0, 90, 180, 270, and 360 degrees and aiming is now rather accurate. I wrote about it here:
https://thehamlab.com/2023/02/02/fox-delta-st2-lvbtracker-calibration-mods/
If you feel this could be useful for you, the source code for the project can be found on GitHub:
https://github.com/TheHamLab/LVBTracker.KR1ST
73,
--Alex KR1ST