On the track down a straight away you don't want to use the clutch, it will slow you down and you won't get max drive and acceleration. The method is when you are accelerating to red line put pressure on the shift lever, quickly roll back the throttle just a tad and it will go right in the next gear. I usually only do that from 3rd gear and up. Your gear dogs are actually designed to work like that. Outside of the track I wouldn't do it. Never do it on down shifts either. Downshifting with the clutch allows you to keep the bike settled and make it a smooth transition. For normal street riding use the clutch, it's there for a reason. Hope some of that info helped.