I have just installed a Bionx kit on my bike, and I would also like to see more assist when cruising at 20 mph. I have firmware 1.5, so I do not have the speed limit removal code 3443 or the torque sensor gain 0007 on my console.
Mace on the Tidalforce google forum has recently reported on using a 39.6V A123 custom battery pack in his 36V system. He reported that the ride went about 20% faster. Tidalforce bikes can also be overvolted into the 40s as reported on endless sphere. I would be very interested to see how the system performs at higher voltages. A 13S A123 pack would give 42.9V, for example.
I am a little confused by the reports from Bionxrider and Zeuser regarding the amount of assist above 17mph. Bionxrider reports diminishing assist to near zero by 20 despite having removed the speed limitation, while Zeuser reports full assist up to a little over 20mph. Zeuser, what energy bars are you seeing on your console when you push the speed up? In the interests of science, perhaps both of you could perform one simple experiment and report back what the no load max speed is when you lift the rear wheel and max out the throttle on your systems. I have no throttle, so I can't try it.