I'm leaving this here as an extra info for the staff. My problem was a really annoying a few second delay on brush strokes and if I wouldn't move the brush at all it would not leave anything on the paper even with build up turned on. Disabling smoothing fixed it for me and at least with a very short test it seems to run like a dream. This problem started only recently, after re-installing my entire pc - I had the PS CC 2018 running even in the last one too with smoothing on 10% with no problems. I have Cintiq 27QHD + an Asus monitor + PS CC 2018 with all the current updates.
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