I have only a small remark on the WTC prelude. Your left hand lines are a little over-stated (particularly in the middle section), probably competing with the right hand melody and sometimes overtaking it. I have struggled with this prelude myself, that's why I dare the comment.
Yes it's a pesky little devil this one. I spent so much work on it and am still not wholly satisfied with it. I do try to make the most of the interplay between left and right. The LH should not be subordinate to the RH here, they're fully equal partners. So whatever I do here is intentional. A lighter instrument would help of course...
So, you have a Gaveau. Sorry but all this time I hadn't noticed. I am deeply touched here, my mother had a Gaveau. In fact, I still have it. It's an upright, really old and despite its rather neglected condition, its sound remains unbelievably deep and sweet. Of course your piano is a grand and understandably different from an upright but still, a Gaveau. I am sure that if I heard it or played it live, I could find a relation with my mind's referenced Gaveau sound.
There is something about this sound allright. With all respect to other, better, instruments, I keep getting back to it. When I first got the replacement Grotrian, I thought like, WOW, this is IT.... But after a while all I wanted was my Gaveau back. How silly is that !