I am a little frustrated with my PCIII so I suppose I have to take it to be tuned. I tried two different maps with stock exhaust and now I'm playing around with my new Leo Vince pipes. The issue I have is the nose dive on deceleration. All of the maps seem to increase that. The stock (or "zero" map) allows a smooth deceleration and I don't have to be so careful. With a map loaded I have to really ease off gently to avoid the nose dive. I buy into the benefits of the PCIII - is the nose dive just the trade off of getting better over all fueling?
Hmmmm, you should not be having this occur.
In terms of 1st gear low RPM low throttle opening :
-Mine ran like crap with stock cans and no PC III.
-Mine ran like crap with the stock PC III map and the Yosh twin TRSs.
-Once I did the TPS synch, and had a decent baseline map in it, it was a different world. (the baseline map was LDH's V-4 Moriwaki based map, and in my opinion is THE definitive baseline map for 919s with stock headers and twin slip ons)
-Once set up as such, I can walk it down to below 1,000 in gear, use no clutch, and just use throttle for control.
So, maybe yours is not synch'd and/or you don't have a decent map in it.
There is also the nature of the stock 919 chassis. It's a high Centre of Gravity design with mush for front springs and very light damping. Add to that mix a fairly high compression engine with high leverage due the overall fairly short gearing of the bike. It's a perfect recipe for being a dive meister pogo stick special, be it from front brakes and/or shutting off the throttle abruptly.
So, if you have a stock front end, in particular - stock springs, all that is surely also part of what you are feeling and not liking.
(My front end is re-sprung and re-damped.)