I am using reloop spin2+ along with traktor pro and found that my DVS calibration is a problem as well.
I have to speed up deck 1, then calibrate deck 2 to deck 1. Change them over so deck 2 is master, reduce the speed on deck 1, then sync and so on. This eventually brings the speed of the tracks up.
Just wondering if you purchase the Traktor timecoded vinyl would this help?