Thanks for the trip photos and videos. Sounds great !
Regarding your clutch slipping, in addition to having several mm. of slack in the cable / left lever assembly, be sure to check the adjustment on the little set screw on the lower left side cover, right above the shift lever. There is a small cover, about 1 1/2" x 2 1/2", held on with two phillips screws. Remove that. You will see a screw with a 12 mm lock nut on it. Hold the screw with a screw driver, and loosen the lock nut. Then turn the screw counter clockwise until you feel some resistance. Now turn the screw back clockwise 1/4 turn. Hold the screw with a screwdriver and tighten the lock nut. This sets the clearance for the pushrod that operates the clutch. If there is no clearance at all, then the clutch will slip, even if the friction plates are in good shape.
I know this from personal experience. The lock nut on mine was frozen to the screw, so the adjustment did not respond as the factory manual described. So I thought I should just leave it alone. Found out later that this is critical to the clutch functionality.