What I was told when learning this piece is to just learn it with the awkward sounding 2 against 1, because for memorization purposes this is very simple, and later accent the first beat in the triplet and focus on just bringing it out to get the proper sound. Also, your right about it sounding wrong when its not at speed. If its not played quickly even with emphasis on the triplet it does sound very wrong. I think the primary difficulty of the piece is bringing out the triplet and avoiding what most people are tempted to do which is the 2-1 rhythm.