Never heard of re - shimming clutch packs, unless they are trying to make up the amount of wear in the friction plates by artificially inducing excess clamping pressure. Who did this work??
A set of worn friction plates will incur clutch slip (roll on throttle and very little forward motion although engine revs rise), was this happening before??
Clutch now sounds as though the pack is dragging somewhat, does it move forward when in gear but the clutch is dis-engaged (lever pulled in).
Any problems take it straight back, if no joy with them, contact a subject matter expert in your area. Near you (well Bristol) is moto-luigi, someone on this site will have his number. Give him a call. Good luck
