HELP... My shorthanded game SUCKS

[Mac]

Can anyone point me to nice references/books/articles on shorthanded play in general (7CS play specifically). I notice myself playing very differently once there's only 4, even 5 players total at the table. I know to loosen up a bit, high pairs, overcards are boss, limit the draws. It just seems that I subconsciously say to myself "OK, we only have 4 players" and I change my game. Specifically, I'm not sure what are acceptable 3rd street starting requirements. I also find myself making bets that don't make much sense only because I'm high on the board and don't want to show weakness. Anyway, this part of my game equals my shoes and I could use the advice - let's assume unfamiliar, capable players for arguments sake.

MAC