So your padded shorts are over your tights? Where is the Underwear Nazi?
I too have some wind tights (non-bib) that tend to slide down in the back so I generally wear bib shorts underneath and constantly have to pull up the tights. The full front wind panels are the only reason I still wear them- almost all my other tights and shorts are bib and are less of a hassle. The best is bright blue shorts under non-bib tights and the subsequent smurf-moon. I think are only two real solutions: pull them up regularly or replace with bib tights.