nl pokertracker findings, very confused

[jayboo]

i recently started 4 tabling the $50 nl games at party and after 7k hands i am up 5.15 bb per/100 but my total aggression factor is way lower than when i play limit(.69) including preflop and limit is (1.56) is this normal or am i playing way too passively i often limp with hands that i would raise if it were limit like AJs KQs etc. basically to allow big hands to raise so i have a better idea of what im up against. ex. if i raise AJ and AK calls and an A hits ill bet and prob be in troube but if i let him raise and an A hits ill bet he will raise and im done with the hand. Does this make any sense to you guys? or am i going about this all wrong any suggestions would be greatly appreciated.Also what would be a normal win rate (bb per/100) FOR THE NL 50 (.25-.50) after 30 k hands or so? Thx for any help. Jay