The main reason to use the a TSS-98, or a TSS-04 would be that the "trail and error" clutching setup/calibration has already been done with this.
IMO... The lighter weight of the TSS-04 is not as critical on the big torquey 900's as it would be with a 6/7/800
The other two clutches that you are asking about are top notch units... you would be reinventing the wheel though instead of riding.
If your secondary is shot... you should have the primary completly gone thru as well, re surface the faces, balance, new bushings, set clearances.
They both need to work as a system... both need to be in top notch shape to get the most out of your sled.