Need Help With My Tiger 1200

Have an issue with my Tiger 2013 model
I need help from all of you guys my bike has been to two Triumph main dealerships and despite spending over £800 in repair bills ( new brake levers ( don't even ask !!!) and tank clean x2 ) the overrevving /hunting problem is still there
1 it over revs really badly between 2 and 4 thousand revs
2 the issue happens when cold or hot and it is intermittent
3 feels like water in the fuel but the tank has been drained twice and no change
4 additive has been added to disperse water also not any better
5 when I pull the clutch in to change gear it overrevs momentarily
6 last service was done at 14000 miles for shims

 

hi thanks for the reply - its been replaced still no better

 

hi
All been done need help or it will go soon getting to the end of my tether with it all

 

no but will do thanks for the tip