These are my suggestions:
4. Eventually, the tempo has to be increased.
This is the part where I don't agree with you. Most people play it much too fast, ignoring the fact that it is Allegretto and not Allegro. Some interpreters choose a totally insane tempo and that could be very fun too, but then it is more of a "cover" than following the original notes. This posting was in a quite good tempo, perhaps it could be a little bit faster eventually, but really not that much. Yes, you can find a million clips on YouTube with stressed tempo but it does not mean it the best one.
The good thing in this recording were the parts with the forte octaves. The other parts were uneven in both rhythm and dynamics. I mean, dynamics is of course necessary, but it should be in a controlled way. I also think you totally ignored the rest marks. I sometimes practice this in an extremely slow tempo where I play with an exaggerated rubato, holding every rest mark far too long to keep the rhythm, but this helps me to remember them when I play in higher tempo and with more accurate rhythm. In such an exaggerated mode you can also practice a very light staccato - be very clear with the contrast between legato and staccato, but no nail hammering.