Yeah, next step would be to adjust both the Bowden cable and also the VCV per factory procedure, and see what that does:

VCV adjustment (note: engine does not have to be running to do this) :
http://www.w124performance.com/docs/mb/transmission/trans_VCV_adjustment.pdf

Bowden adjustment:
http://www.w124performance.com/docs/mb/transmission/trans_Bowden_adjustment.pdf


0-60 in 12 seconds is what it SHOULD do, nice to hear the car has normal power...