I have the YSS RZ 362's that you mention, got them at EPM Performance in NJ, custom set up for my weight and riding style. I got them in 2019 when there was nothing really available, and they work great, and only cost $500 bucks at the time. I'm pretty sensitive to good suspension, and the YSS does the job quite well.
I also did my front end, also in 2019 when there was nothing available for that either. I got a set of springs from Race Tech and a set of Ricor Intiminators, which I had used previously on my SV650, and the front end was also transformed.
If you do the rear only, you'll find out how bad the front end is and will look to do that too.