After 2-3 days of pracitising just that darned passage (Bar 5-12), it seems I have made little progress. Left with no other choices, I decided to appeal to the outside world (pianoforum) with my problems.
Below was my (quite urgent) message for help.
It seems that no matter how much I practice, I still have troubles getting my RH up to speed (around 150). At 130, my notes start to bundle together, forming at tata-tata rhythm , and I dunno if there are any better methods to practise the RH.I recorded my playing (Bar 5-12 only) to further illustrate my problems.
Same passage with speed digitally reduced by 70%.