Normalized and Saved As a take in SF - obviously there is a simple trick to dropping it back into Vegas and in synk with the video track it belongs to.
Did you "Open As Copy" in SF? That works for me. Just tested with, Normalise, NR and Vol boosts . . works and is in synch.
Once Openned as Copy in SF THEN a save in SF, go back to Vegas and your New SF take is in and if you right click on the audio and go down to Takes you can select the previous one for comparison. I do this regularly.