If playing it really slow is still not working (if you are really diligent it should), add this to the mix.....make an exercise out of just playing ocatves (the first two notes of TT), then the dom 7 interval (the second 2 notes of TT) and then the fifth (the third 2 notes of TT). then make exercises of moving ONLY between notes one and two and notes 3 and 4 of , and then notes 3 and 4 and 5 and 6 of TT, again VERY slowly, and only notching the metronome up unitl you can play the exercise at the current tempo. When you move the metronome up it is OK that you cant play the next tempo, just keep working on the new tempo until you can do it.
Good luck.....