Hopefully I can not muddy the water, here.
There is a misconception by some that the DW valve is electronic. It is not. There is a solenoid that the gcu applies power to that draws a hammer in to strike the valve stem. The gcu creates a pulse at the selected voltage, for the selected time(dwell) to create a very specific amount of total energy applied to the solenoid. You could look at it as a very controllable spring to drive the hammer... still mechanical valve, though. There are some advantages though. The hammer will always have the same stroke, but there is NO preload and the movement is virtually frictionless, and the speed of the hammer can be very high without hammer bounce issues.
Soo... I really don't know how you would calculate the pellet position in the barrel at valve closure but the standard tuning stuff still applies. The higher the reg pressure, the faster the pellet will accelerate, so shorter pulse of air equals more efficiency for given velocity. What Daystate has given for your tuning info is a reg pressure number in the Factory mode that it expects for calculation purposes. It's VERY high so that all the projectiles you are likely to use will be covered at the velocities it is capable of. These are NOT optimum for best performance of MOST of what you'll shoot. The way that I've approached it it to lower the reg pressure to the point that it will only make a few ft/sec over the target velocity, no matter how much dwell and voltage are applied, then back them off to the target velocity. The voltage and dwell are almost interchangeable for varying , but you should stay a bit away from max voltage (88 v, I think) to be safest on electronic components. Lowering the reg pressure will give an error INDICATION when in Factory mode on early models but in no way is an actual problem. It just has to calculate in a different part of the curve. As a note on rifles I've shot so far, when the reg pressure is high, the ES will likely be higher and first shot after sitting will likely be slow. The plus is that you can use about any projectile it's capable of launching with one reg setting.
All that said, there are differences in the accuracy from different reg pressures. Harmonics and pellet obturation are likely suspects. Chasing power is easy but chasing best accuracy may require a bit of tinkering.
I realize I didn't directly answer your questions but feel they are based on a conception of an electronic valve. I hope I've enabled a visualization of the system so you can adjust it with more confidence.
Bob
