tracking issue with ASA DDM mount on 20 june and spectroscopic observations

I found that the tracking of my ASA DDM85 mount started to show some deviation. I therefore recorded a few pointing models this night and then performed polar alignment. The result was that, for the polar alignment, I had to adjust the altitude knob of the mount quite a bit. The final polar deviation is now 8 arcsec in RA and 5 arcsec in DEC according to the software calculations. As a test, I observed comet C/2017 K2 (PANSTARRS) and the tracking proved to be correct. Meanwhile i could capture 2 spectra of Be-stars: QR Vul and iot Lyr.