Jeff Weaver's Post Season Sucess and L/R splits

Ever since comparing Marquis and Weaver in azruavatar's Jason Marquis Diary I have been thinking about Jeff's L/R splits (posted above).  What strikes me about his splits isn't just how much worse he is against lefties, but also the number of left-handed plate appearances that were recorded over the past year or three years.  If You will notice, lefties have logged more plate appearances than righties against Weaver.

Now, even considering 100 point (or 10%) OBP gap, I don't THINK the number of plate appearances jive with the number of lefties and righties in a typical line-up.  I don't know for sure, but I imagine the difference is due to opposing managers giving righties a rest against Jeff and playing a lefty back-up.

Anyway, it strikes me that in the post-season, at least in the WS, that Jeff may not have faced his typical mix of lefty and righties.  If so, could this be a large part of his sucess?  Does anyone know where I might find left/right postseason splits for Weaver?