Explorer Xc Clutch Problem

I have a 2013 tiger explorer xc that the clutch slips when you accelerate hard. Seems to be better when its cold and gets worse as it heats up. I have replaced the friction plates, total height of stack is within spec., installed new springs and new lifter plate. I really thought new friction plates were going to take care of it but no luck. Slave cyl good, good lever response, engages and releases good. Clutch plates look and feel fine. Any suggestions would be great

 

I use Castrol Power RS full synthetic 10w-40. That is what was in it new so I stayed with the same type. If I remember right the mileage is around 58000.0 . When I had the clutch plates out I cleaned them and ran 220 sandpaper over them just to scratch the surface. I never did mic the clutch plates but I did the friction plates and all of them were still within spec. As far as I know there isn't anything else that could be slipping on hard acceleration. Maybe I should order the clutch plates also. It just doesn't make sense but yet there is something wrong

 

No it is Castrol RS Racing 4T full synthetic 10w-40 motorcycle oil.

 

Thank you for your input

 

Thank you for your input

 

Well thanks to the people on this forum and the post i read about a guy that had an Explorer xc just like mine that if he accelerated hard the clutch would slip. he later found that it wasnt the clutch at all. It was the drive shaft turning inside its self. there is some kind of rubber filler inside the larger part of the drive shaft that the smaller part slides into. I am sure that it is there for some cushion and to take out some shock going to the bevel gear. I have some pictures of what i found that i will post. i think this is not repairable but if it is please let me know. where is the best place to find a drivshaft, could you let me know please