Nothing wrong with smaller bikes, both for street and track. Just thought you are tracking the R6. Are either of your bike all paid off?
OEM suspension is ok if they are fully adjustable, so at least there is something you can kind of do about them. There is pretty much nothing you can do with the OEM non adjustables, other than fork springs and oil; unless/until they have emulators for them. They shouldn’t post too big of a problem until your pace increases. I am no guru, but if you are interest in the dark art, I have many resources that I can share; Some are in the stickies btw.
In 2014, LRRS is phasing out the 500’s in the Sportsman class and will be replaced with the 250/300’s. Just like you mentioned, the smaller cc bikes is a friendlier class to get into trackdays, because you can’t kill yourself with the throttle…alone :rofl