When accelerating at a reasonable pace and upshifting, I always take the car out of of one gear, wait for the RPMs to drop, then put it in the next gear. With this heavy flywheel, the pause is significant.
That's not a double clutch, it's just waiting for the revs to drop. Obviously, if you are at higher RPMs, that drop will happen more quickly, to the point where you can basically quickshift.
You can tell when you're doing it right, because it slides right in
.