No offense taken, but at the rider class for a track day they recommend clutchless shifting.
Clutchless shifting, done right, will upset your suspension the least and overall make you smoother.
In talking to fast riders, smooth=fast. With practice(not much mind you) it becomes second nature & very smooth.
Down shifting is smoothest for me with a small clutching. It's surprising to me how little clutch is needed to downshift smooth.
I say give it a try it is easy and with a little practice fast and smooth.
P.S. I also do it on my Harley. It is clunky at low RPM but with mildly aggressive acceleration it is smooth.