Thanks for the in depth review!
for the time signatures, I tried to implement that at mm. 8, 9 with the duples, although I am not sure if it is that obvious or effective.
another spot is at 76, where the left hand stays in triple and right wanders in duple eventually aligning back together
Yes, right hand is very much the prominent figure the entire time exept for mm. 10. However, it would be nice if you could suggest other spots that is fitting for left hand to be more prominent, as it is very easy to miss.
Yes, I originally intended mm. 14 to be a further development of the main B# C# F# theme, I think the octave leap made it unclear of my intent, I have added it to the development section.
thanks ken