My experienced track riding friends insisted that I not do any throttle blipping when I got my R6. My old bike was an 80's hunk of junk and required a fairly deliberate throttle blip for downshifts (the motor was slow reving). It became a habit with the old bike so I actually had to force myself not to blip on the track.
That being said, I find the rear stays much more settled with a very small blip for each downshift. If I just drop the clutch, the rear tire will squirm back and forth which was unsettling at first when I was first learning, but becomes something you get used to. I followed my friends advice for a few trackdays and then tried my own thing. Just the smallest bit of momentum put into the motor with a blip seems to make the downshift much more composed and keeps the rear tire from squirming around as much. I want to make it clear that this isn't a rev matching blip, just a tiny little one, maybe a thousand RPM. Keeping yourself from changing your brake pressure while blipping just takes practice.
On topic, I would love to do the slipper clutch mod sometime, but will likely work on my own riding habits for a while longer before I change anything. This bike is still much more capable then I am on it.
Disclaimer: I have an 06 w/ stock slipper clutch. What I said above is what works best for ME to keep my bike settled under hard braking. YMMV. I use my index and second finger on the brakes and third/pinkie on the throttle. This has always felt comfortable to me.