Bachmaninov... i must admit Horowitz' recordings aren't the most "romantic" i've heard, but if he recorded them that way is because he wanted the etude to sound like that, and that's the same for all great pianists who recorded music.
Jennbo, i'm playing the etude right now. You must draw in your mind how the left hand is moving. Slow practice with left hand means that you follow a line in your movement, and you go to the next note at 100% precision taking in consideration towards what point the hand is moving, and not having your hand moving in the same way two consecutive notes (balance it at very slow speed). Do not allow yourself to play any off-tempo or wrong notes.
If you have problem with 2/3 or 4/3, try playing the op. 8 no. 9 (c# i think)
Here's a way to make it work: 4/3 - you draw 12 lines, and on the top you separate them into 4, and bottom in 3, and start counting at very slow speed the 12, accentuating the 4 on right hand and 3 on left. Progress until you reach the speed you want the etude to sound at.
Also, 3/2 is op. 8 no. 8 (A-flat). Very beautifull etude... one of my favorite Scriabin... Has the main theme in 2/2 and then 3/2 and 4/2... you should try at least sight-reading it. Also, Chopin has the Three small etudes... i don't know what opus they are... but the second one, in A-flat is only 3/2, also beautiful harmony and melody.
Don't strech! I almost destroyed my hand because i streched too much... i can get the d# to g#, but i'm rolling it. Your hand's natural position is not streched, and when you strech it, you are forcing your muscles and tendons.
Hope this helps.
Bitus.