I just put a Guitar Fetish vibrola on my modded Tele custom. It all went beautifully and the axe works like a charm. I shimmed the neck, and now it plays better. I noticed that the roller bridge was tilted back. Hasn't been a problem yet, but I was wondering if it will be a source of heart ache further down the road, i.e. ripping out or something less extreme.
if it's a roller bridge I would think it's just been set in the guitar at an angle, I doubt it's any pressure pulling it backwards, next time you take your strings off though check to see if the angle changes
It looks like even the height adjustment screws are angled back. Could be that it's just produced that way. It's weird, but maybe.