Sorry to hear of your MP11 but glad your replacement is better.
I really like your idea via a Logic environment BTW, very cool idea. It's interesting how many ways audio can be organised.
Just offering food for thought that in Standard and Pro we're not limited to only volume per note.
I think the answer is 'dynamics' per note in Pianoteq Standard and Pro.
You can alter 'dynamics' per note - analogous to a per note adjustment to your velocity curve. Definitely should manage more than 15% higher or lower 'velocity' range for any given note.
[Maybe something for a long timeline, but a separate velo curve per note like the main one, could allow some deep adjustment.]
As for now though, as I understand it, there's not a 'velocity' per note setting anywhere only because it's a singular data point per note (0-127), whereas 'dynamic' expresses a range for each single velocity data point to fall within, relating directly to your key strike, which is variable. That's why feeding the midi through Logic is a good fix (but it's post parsing single velo data points) - but maybe keeping to Pianoteq will allow you less hassle overall, esp. if the fix is just as good or hopefully better and/or simpler. Anyway, that's what I'm hoping.
So if a stand-out note needs more velocity to get to your ideal, lowering dynamics for a note will mean you don't have to hit it as hard to get a higher velocity quicker.
Complimentary to this, regarding a stand-out note needing less velocity, by raising dynamics for that note will mean it will need to be struck with more force to get to higher velocity.
In that way, 'dynamics' is fundamentally related to 'velocity' - and should be able to do most of the heavy lifting (unless I'm really off track - happy for better understanding).
I'd be keen to try to sort out any keyboard issues with this first though (keeping it all in Piantoeq future-proof and cross-platform) - and to make any note more precise, there are also per note settings for other things which can help sculpt a perfect fix, like:
Hammer Hardness for 3 ranges, Piano, Mezzo, Forte
Hammer noise also can make a diff with velocity issues
Impedance
Blooming Energy
Blooming Inertia
and others incl. volume for a final leveling.
Any number of even tiny tweaks to some of these as well as dynamics can help make a great difference to how the 'new' edited note can fit in to it's neighbouring notes.
Pianoteq Studio Bundle (Pro plus all instruments) - Kawai MP11 digital piano - Yamaha HS8 monitors