As I stated earlier in this thread, I am the opposite of TrentonJoe. I like having my players IQ's in the B range at end of FR season, and so would be A- by end of SO campaigns. I go with 25 all the time for Defense, and 25 on OFF for a young team, 20 for an older team.
Trentonjoe, I believe wants his players to max out their individual attributes first before focusing on the IQ.