My questions is, and I'm also sorry of this is obvious: When you bleep the throttle, and down shift, do I let go of the clutch slowly, or let it go fast?
Well, the ultimate goal is to do it all as quickly and accurately as possible. So the short answer is fast, but it takes practice to get there. If you start dumping the clutch on downshifts before the accuracy is there, especially with a bike this powerful, you could be setting yourself up for a world of hurt.
One way to think of it… relate it to what I described earlier about keeping the throttle steady. With that method, once you pull the clutch, the RPMs are going to rise at a given rate with now the unloaded engine. Once you're practiced, if you let out the clutch quickly the moment the revs pass through the new RPM of the lower gear, there's no jerk as power is reapplied, and you're perfectly shifted.
From that as a starting point, the only reason to blip the throttle is if you want to speed up the shift. You want the revs to go up faster than
just unloading the engine and letting them rise… you want them to get up to the new RPM as quickly as possible. At that point, just the same as before, you let out the clutch quickly at the new RPM.
Does that make sense? I have a way of overthinking things and probably making it more complicated than it needs to be.