Reply to vestax vci 100 pitch tsi

hi,i'm new to the community ,my name is Stefano and i write from Naples,Italy.a couple of day's ago i bought a vestax vci 100 (mk1),and since the first day,i notice a big imprecision of the pitch fader in traktor pro 2.5(for example,i start eith the pitch fader to '0' position at 125 bpm,to increase,the minimum step is 125,16 o 125,18 !!!)
does anybody have a solution,or better a tsi file to solve my problem??
i'm not to good with midi mapping,and i dont believe that my problem depend of the firmware version (1.2 i believe...)

thanks for the help and,my best regard to Mr Golden....and sorry my english!