When I learned this, I actually worked this without pedal at all first. It forces correct fingering to keep the held voices to their proper duration, which also REALLY helps a lot with the voicing in this duet.Yes, you have to add pedal back in, and I agree that fluttering, or half pedaling is probably the way to go.... but try working I without pedal at all, minding to keep everything held to its duration. I did this with 10-3 as well, and it really worked to clean the voicings up.I know that the question was about the pedal technique first, but with all things piano, the cleaner the underlying technique, the easier the additional techniques will be to apply. How much pedal you need to sustain notes is directly related to your voicing and how well your fingering and technique is allowing you to hold the pitches WITHOUT the pedal.Enjoy the wonderful etude.