ammendment...
clutchless downshift only when necessary. usually i would hit the brake point, brake, pull in, bang down 2 or 3, then blib and release for normal off the straights downshifting. I had tried the downshift through every gear, but that was a waste of time and energy.
Now I just do the above.
As for the decreaser, the only one i've needed to use that on was before the right horseshoe at fontana. The gear change is during braking, so the bike is picked up a little anyway, so rather than change position unnecessarily on the left hand, just blipandbang down one for the turn.