Very interesting. I've been doing wide grip -- and my PECs are getting YUUUGE (well, not really, but bigger!) so I guess I'll have to start the close grip.
Isn't the bodybuilding "rationale/standard" to use both -- wide for the pecs and close for the tris? I know Beachbodys "Body Beast" does it, but with dumbells (yes, I admit, I own the package, don't think too badly of me, I really have come around to the force!).