It can't hurt to rest if you are completely sure you will remember to fix your rotation for the playoffs. I just looked at your team and they seem okay based on innings, I didn't look at their actual pitches thrown.
I say go to the 4 or 5 man rotation, and rest any hitters below 100%. Also start scouting your likely 1st round opponent. See if they are a steal team, lefty/righty heavy, or have a weak arm at catcher. Little things can decide playoff series, especially a 5 game series.
Congrats on making the playoffs