thanks for your answers.
i can, and have been using, d3doverrider to force vsync. but: it doesn't work together with enbseries 2.1. so i'm looking for another way to force vsync so i can use enbseries.
my card is a 5870 on win 7 x64. the drivers can't do vsync on their own in BS.
"You're right, you cannot start BS with a profile in ATT, but if you set up a profile and start BS via the desktop shortcut the settings from the profile are applied to the sim. I don't know if this works for vsync though as I always play with vsync off, but AA/AF definitely work in this fashion."
- I don't think it works with vsync, i'll give it another try. EDIT: no joy, can't get ATT to work with BS.
so far it looks like i can't use enbseries bloom mod with vsync. that sucks. BS looks too dull and colorless without it...