Left hand slap after pop?

[farboozle]

So I was going through Anthony Wellington's paradiddle exercise last night (Thump, left-hand slap, pop, left-hand slap, repeat). I couldn't get the left-hand slap after the pop to be smooth, because I'm so used to a left hand slap after a thump.

If I thump open strings, my left four fingers are already off the strings, the slap down comes naturally. If I fret a thumped note with my index finger, my other three fingers (middle, ring, pinky) are off the strings, ready to slap down naturally. Of course, if fret a pluck/pop note with my index finder, it could be the same. But fretting a pop note with the index doesn't really work with the thump pattern.

For the whole pattern, thump (index) slap (other three) pop (pinky or ring) slap (fingers?), what fingers do people use? Do you fret with pinky and keep the other three off the strings and slap with those? That was awkward for me, but maybe I just have so much muscle memory for the left hand slap with middle-ring-pinky.