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Look at that assembly again. The spring is forward of the pressure plate. The pressure plate is forward of the disk. You put in a thicker clutch disk. That moved both the pressure plate and the center of the spring forward away from the back of the transmission. The clutch rod didn't get longer. So the adjusting bolt at the back of the transmission needs to be readjusted.
Start at the top. Adjust the knurled adjuster at the handlebar so there are 12mm of threads exposed between the adjuster and its locknut with the locknut against the perch.
Then go to the bottom. Loosen the 13mm lock nut and adjust the 10mm (head size) adjuster bolt so that there is 7mm free play between the lever and the perch.
Then try the clutch action.
Additional thought: the disk goes in so the extended side of the hub points to the rear of the bike. I'm not sure it will even go in the other way on that bike, but if it did it would push forward on the spring I think.
According to BMW the clutch disk changed in 1997 to a thinner disk. When changing the disk in an earlier RS the pressure plate must be replaced with the new one. The new one is thicker.