A baffle-style stripper for an FCC process comprising sloped baffles in which a greater volumetric flow rate of stripping medium permeates openings in a bottom section of the baffle than through a top section of the baffle for low catalyst flux stripping operations. When low catalyst flux is used, the catalyst runs from baffle to baffle closer to the bottom edge of the baffle. Hence, more fluidization from stripping medium is concentrated near the lower edge of the baffle. The greater fluidization at the bottom section of the baffle is accomplished by providing greater opening area per baffle area in the lower section of the baffle than in the top section of the baffle.