I think I actually did it! All the fastboot stuff seemed to check out. I found the CW touch recovery and permanently flashed it. At the moment, I'm backing up the stock rom (wow that takes a long time!). The other post says:
there is not much to explain with this one. if booted to recovery from above,use the recovery menu on your phone to:
*make a backup of your stock,unrooted rom. this is NOT an option! please... do it.
-wipe dalvik cache
-install zip from sd card(chose your superuser file)
But I assume I can skip this since I already have the superSU working? Also, what are the basic steps for flashing a new ROM?