I don't seem to be earning XP quickly enough to progress my players...What is the best way to earn XP and what are the best attributes to spend them on? Speed is obviously good but where else....
O-Line?
TE's?
WR's?
RB's?
DB's?

Awareness is the best attribute to buy, IMO. Position specifics are good but AWR really makes your player better. For instance I have a WR with 70 catch who dropped passes all the time, and then after bumping his AWR from 45ish to 80 he rarely drops and plays much better overall.