Its your hardware. You're going to have to be better than everyone else to break even with average PC players.

My FC has been running people through Turn 5 lately and the PS3 players are always bad. We have to yell at them for conflags and divebombs. After a few people have said "I didn't see it", I'm starting to believe them now (instead of thinking they're just bad).

I'd definitely go wired connection. It could make a huge difference depending on how far your router is.