I know it's not popular, but I always carry extra bats early.
Early on I want a bunch of hitters and RPs. I don't carry enough SP to hit the season IP limit for the first month or so (though I always like to keep a streamer slot going).
When there's so much early volatility going on with hitters and RPs, I want as many chances as possible to find an early waiver wonder. I absolutely hate loading my roster up with guys who do nothing for 4 out of 5 days in the early going.
IP can be made up later. The waiver studs that emerge in April can't be had for free later.
The downfall, of course, is that early in the season is great time to get in innings, but that's what the streamer slot is for.
10 team 5x5 ROTO (OBP), 11-player keeper, C/1B/2B/3B/SS/MI/CI/IF/5OF/UTIL/8SP/3RP
C: Castro, Montero
1B: Rizzo, Adams, Lind
2B: Kinsler, Kipnis
3B: M.Cabrera, Frazier, Reynolds
OF: Stanton, Trumbo, Choo, Marte, Rasmus, Blackmon, Bradley Jr.
SP: Gio, Scherzer, Ryu, Cashner, Kuroda, Lackey, Minor, Wood, Peralta
RP: Balfour, Perkins, Nathan, Frieri, Fields