But what convinces you GSAP didn't trigger? I know how a clutchless upshift works on a regular bike, I just don't think rev matching is all it takes to inhibit the system. From what I understood, if a gear change is requested in the absence of clutch lever pressure, the GSAP will try to works it's magic, essentially cutting the throttle(or blipping it for downshifts) in order to rev match and execute what is essentially an automated clutchless gear shift.Maybe, you dropping the revs helps for smoother GSAP upshifts but in my experience it's not the case at all! If I decelerate prior or during an upshift it's even more jerky and awkward, and that is IF the shift occurs at all... I wouldn't rule out a defective GSAP unit in your case. On the other hand, the fact that GSAP shifts need more strength and a more deliberate movement is by design and not a fault with your unit. GSAP does not care one bit for sloppiness, but I agree there is a big difference in GSAP response across bikes, even from the same gen and similar mileage, and that's a bit disconcerting. GSAP is a skill that needs to be honed but that doesn't transfer to other bikes as each one seem to set in differently.