There are many many things in life that I like constant but I thought you were working on an ignition kill and not your philosophy of life.
LOL

On the older bike, the ignition timing, boost, shift points and kill times are all fixed. It's KISS and reliable. The gains from the shift down track would be small compared to say adding another PSI of boost or just going on a diet.
I assume you have data showing the effects of the shift using various techniques. That would be very interesting to see. No need to disclose anything proprietary about what you are doing but rather just show the end result.
Unfortunately, I cant show you the graphs as this is the knowledge we've gathered in the last 15 years in motorsport industry.
It's not just about the shift speed gain - the duration of the "cut" (and the cutting strategies used) determine other factors - stability of the bike/car in tricky conditions, smoothness of the shift (engine likes smoothness and so does the gearbox and all other components). If you have 24 hour race rough fixed shifting, you'll probably end up failing the race.
If you're too long on the cut, this brings all kind of troubles, so does cutting too fast. Each gear is different - let say you start loosing a gear in a race. Once this starts happening, with fixed timing, you'll just destroy everything and not finish. Cutting the engine (with combination of rev matching) helps on downshifting as well, cutting too long will drop the rpm and make it rough as hell, possibly loosing the grip. This can be a huge problem in the rain. Just to name a few.