I'm struggling a bit with the tempos in this piece. I just can't decide about them - especially in the L'istesso tempo - the pacing there is hard for me, and I should work more on that.
But I feel the middle section lacks the attentions you always give to every note, every phrase, every detail, rather just trying to get sounds out of the piano - as you mentioned, you need a grand - I don't think Rachmaninoff composed any of his music with an upright piano in his mind.... Otherwise, your performance is always so inspiring! Rachmaninoff is just not a good friend with me, but I am inspired to give a try. I hope you will find a way to practice on a grand... How do you adjust so quickly for a concert? Do you feel your upright piano sometimes cause habits that make the adjustment difficult? Please share a video of your concerts!