In regard to body tilt...
A teacher whose class I took recently had the girls practice their sugar push by walking 1, 2, 3 and 4, 5 and 6 forwards. Drive your steps by pushing with the back foot. It's the guy's job to stop you from ploughing him over. This really helped me a lot.
I try to be centered a little bit forward, but not actually tilt. I just tried it, and I foound that I do tilt forward a little on the three and four. I'm not quite sure if this is right.
P.S. For technical questions about WCS, try posting to the newsgroup rec.arts.dance, where there is a rabid and knowledgable WCS community willing to answer nicely posed questions (just don't take offense if they argue).