^Maybe you're running more camber, so most of the wheel is further inside the well?
I know that was the difference between Matt's (allGO) car and mine. We both have 8" wide TL rims, +45. Mine are flush with the fender with no spacer (maybe even stick out a little) and his are flush with a 10mm spacer, but he is much lower than me and with his camber he needed spacers so the top portion of the wheel wasn't sunk.