It is definitely the clutch link/cable. Today I went out on a long ride, and the problem simply does not exist when I change gears without the clutch. Also, riding slow (30mph) in 4th, then WOT---no slipping of the clutch, however even if I just slightly rest my hand on the clutch lever----slipping. So, I think it's the linkage, which is definitely the smaller evil!!!
As a start, I think I'm going to lube it. It will be raining here all week next week, so I'll probably get a chance to ride again in the weekend.
I bought a syringe from the pharmacy store, but trying to fill it up with some oil, I dropped it in the oil bottle, lol... anyway, decided to order this:
Placed an order, should be getting that sometime next week hopefully. Will report back if lubing the cable solves my problem....
It would have been so much easier if I could meet with many of you in person, seems like you would diagnose the problem right away, but small world..not so small..