A lot of thoughts have been expressed now in this thread. Some beyond the initial scope.
PC-V
with AT modules costs more than a TTS, right? And with the PC-V you'll have to add another piggyback if you want to address throttle progressivity, but I don't think the ThrottlePak will allow anything close to the adjustment (if you have any such control at all?) which you can do natively. With
any piggyback which can alter spark timing (you do want to be able to optimize that, right?), you'll find that the stock EFI's Ion Sense combustion monitoring will not have as good a chance to work properly.
Reiteration: For the Harley, you'll not find any EFI system more capable than the current Delphi packages. That's all I said before, maybe just not exactly those words. I never opened any ABS, infotainment, airbag, or any other cans of worms.
If a person truly is a good tuner but they're still stuck in the Stone Age of EFI, their learning curve should be short and sweet and I'm sure they'd not only not charge you by the hour to get a bit up to speed with a much better method/system, but they might even throw you some bones for introducing them to it.
To the thread opener: please do not use a piggyback controller. Visit
http://www.mastertune.net/dealers.html and look for somebody in your area. If nothing jumps out at you, click your way over to
http://www.docsperformancetuning.com/ (a link within the previous linked page, and a forum member here I think goes by "Doc 1"), give him a call at the number right there on that home page, and he'll likely have somebody he knows and/or trained right in your area to recommend. That's if your guy is unwilling to take a look at and try the TTS.
I'm not affiliated with any manufacturers or sellers of any of this equipment, but I have used the TTS myself and I'm telling you, with the latest calibrations you can smooth out your VE tables something fierce all while keeping closed-loop up and running. You'll definitely notice the smoothness and power at part-throttle operation with smooth-flowing fully accurate VE tables. Even if you were to wind up spending a few hundred dollars extra for the TTS and getting your ECM set up correctly with it, you will honest-to-God forget all about the money before the first tank of fuel is gone through. And it will continue to seem a bargain through every subsequent tank of fuel. You'll have closed-loop control to maintain the level of tune in the face of different fuels you'll run into, as your equipment ages (your fuel pressure will surely fluctuate over time, as well your injectors) and you'll not be throwing money away at the pumps while insulating your combustion chamber and exhaust system with a bunch of extra carbon because you open-loop tuned for possible worst-case conditions.