I'm not afraid to drop my staff to 9 pitchers for the playoffs. With the off days, you can probably run three SP. So that leaves you 6 in the pen. 3 LR, 2 SU, 1 CL. By doing that you can add "specialty" players. D-Specs, basestealers, power bat for PH VL, etc, etc. Just drop the pitchers you don't want pitching anyway.
You have to set your rosters the half-cycle before the playoffs begin. IOW, you can set it at 7 AM for the 11 AM start.