Wizard would be the best bet if they are willing to do the modifications for you. I can see some concern over running the dyno at the higher voltage in terms of wear and tear on the MOSFETS, so I don't know where they will be at with doing the mods, but it wouldn't hurt to ask. I wouldn't recommend any experimental home repairs unless you know what you are looking at in there - a 5v dyno is way more useful than a fried 7v one.

The software upgrades and calibration are pretty much proprietary at this point. I guess it could be packaged up for sale, but it was written without Fantom's support/input, so I don't know if there would be any big problems with that or not. It wasn't something that I had originally envisioned for the software although it is pretty robust.

As for the tuning questions - there are obviously a large variety of opinions on this, but I would say that I think you are basically on the right track. The graphs are a really nice summary, but the interesting stuff is often in the time based views. Time to maximum RPM, and time to maximum power are interesting, as well as where the power peak lands in the RPM range.

With springs and so forth, you may find that the peak power and RPM aren't too much different between some of the combinations, but you may find that where the peak power occurs in the RPM range varies. This is where it gets a bit more interesting.

Torque and power at selected amp ranges is another good one. This is where the CE TurboDyno really shines because you can preset those ranges and it stabilizes the drive motor at each of the amp draw (or torque) presets and takes a pretty consistent read. I do most of this type of tuning on the TurboDyno as opposed to the flywheel dyno, but it's still interesting to see what happens on the flywheel as well.

You're also right about not all motors running the same with the same springs - for stock and 19T, we're talking about machine-wound comms. It's a complete wildcard in the equation as well as the manufacturing tolerance on the cans, magnets, etc. It's a bell curve type distribution of performance based on the characteristics of the raw materials alone. The "genetics" of the motors are often the key determinant in performance - sometimes there's nothing you can do to make a motor fast.

I could ramble about this for days too....