I would disagree that SS needs to be fixed. There was some extensive math done on rotation changes to accommodate for high SS on
this reddit post which was pretty interesting.
The summarized version of it was that with 600+ SS, you only have to apply DK every 3rd rotation (it falls off but only for the DK re-application, which ends up being a dps gain); around 850+ SS, you only have to apply DK AND TS every 3rd rotation (they don't fall off at all).
I did some parsing on these and they do increase damage output. With that said, it is a change most monks are probably not used to since it would no longer be flank > flank > flank > rear > rear > rear/flank and instead would require you to alternate between flank and rear more frequently.
I'd recommend to read it over and give it a shot before attempting the SSS dummy again (not sure which one you're referring to nor what your ilvl is).