Ok you can do one of two things reduce the throttle speed down when releasing the clutch or you use a weaker spring on the idle pulley (but you may have problems with top gear as it might slip).
As to a manual I will have a look and see if I can find one so that I can upload this week.
Regards,
Bruce
Please do not PM me asking for support. Post on the forums as it helps all members not just the individual.