Thanks for the lovely comments
Regarding the structure, I actually only recently extended it quite considerably - from where what I think of as the A section comes back down to the Bb sus, it went straight to the "Coda" - i.e. where it returns to the G5 (the first chord), and then fades to the Eb major.
In fact, I was so enamoured with that first progression, that for a while I was actually just doing a straight repeat, but louder, and then the Coda.
Having got back from holiday in Last month, I suddenly found the start of the next section - from the Cm7 chord - and then drove myself nearly insane trying to work it back down to the original Coda. Like you, sedonepix11, I am one of those composers who can only work at the piano by trial and error, which can be very slow going! I have toyed with doing A-B-A-Coda, but so far I'm erring on the side of "less is more".
Regarding the performance/recording, I was inspired by sedonepix11's lovely recordings to buy Pianoteq4. I may do an acoustic video on my Kemble, but they take ages, as I tend to get red light fever, and end up having to loads of retakes - at least with the software recordings I can tweak the odd note if needs be, without having to retake the whole thing.
What I really like about Pianoteq4, is that it doesn't have any audible velocity crossover points, which I found to be a complete PITA with Ivory 2 - this piece requires very subtle, slow-breathing swells and dips, and the brutal velocity breaks in Ivory stuck out like sore thumbs!
I have since tweaked the velocity response curve of my DP with Pianoteq's assistant, and I could easily do a much better take I think - hopefully, this would satisfy Tim's point 3. I'll nudge the thread with a new link if I do.