I can't be sure, but from your description, I think you're doing it the same way since you mentioned switching the tremolo over to the left hand.
By rhythmic accents do you mean phrasing them as triplets? Thats what I did and it eventually worked for me.
Thank for your comments,Yeah I should have made it clearer - I am changing hands with the tremolos. I am not sure what you mean by "phrasing them as triplets". What I meant was that I practice it by making one note of the triplet longer than the others (ie. long-short-short; short-long-short; short-short-long). I've also started practising volume accents (ie. loud-soft-soft, soft-loud-soft, soft-soft-loud), making sure that the softs are very soft as this is needed where the RH has the melody. It's actually come a fair way since I last posted. I just wondered how other people practice these types of passages. Also you make a good point about tempo - most recordings I have listened to take this section very fast, I will try and hunt down more recordings. Thanks again.