Special thanks to John Beima for all the time spent with me troubleshooting this not very well designed 3d printer.
After more investigation i am pretty sure that it is a system issue which cannot cope with the bed mesh leveling properly.
What i have done so far:
1. New probe - SuperPINDA form Prusa Research
2. Made the bed as flat as possible using bloody adhesive tape to rise the depressions (i have repeatedly done mesh calibration and stick a bit of tape in the depression spots to raise them to as close as possible to the ZERO level)
3. I made sure the probe is not affected by the temperature
4. I made sure that all the z lead screws are operating smooth, even and with ease
After all of that i have run a test print and while the bed is now much better leveled - the RatOS does not cope with the correct level compensation.
I will do more investigation with compensation settings and update here.
I have been fiddling with the bed mesh settings in the Printer.cfg and i have found these settings better than the stock ones. These are the only ones i have changed.
[bed_mesh]
probe_count: 18,18
move_check_distance: 20
split_delta_z: .025
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