Its almost rare that I get the solver to converge on a target with "slew to target". I dont know if its a backlash problem but if so, maybe the target slewing needs to take out backlash. Anyway attached are logs that should show my first target worked but the second did not. In fact it would not correct for a large error.
Could you clarify your scenario? In the first log, there is no solve, only failures to run a preview from the DSLR. In the second log, you are solving at DEC~90°, solver succeeds and rotates the mount, but fails at some point because the DSLR fails to expose. This seems to be a polar alignment procedure?
Besides, I see that the backlash value that is set is out-of-bounds for the mount but I don't know if it has any impact.
Also I see the message "mount does not support syncing" but I can't comment much on this.