I use to play the same way
Lately I noticed that if you up your aggression from late position in unopened pots but still maintain a tight image your bets get through a lot more. If people are playing tight enough it may be +EV to open up your range to 40% (A2+,K2s+,k7+,Q4s+,J6s+,T7s+,22+) but with a lot of this range you really need fold equity to make the hands profitable and even then some of the hands are really close so I find that if you get rid of the worst of these hands you get a lot more steel attempts through.
Also I feel that losing a medium sized pot then not having enough chips to make plays/call short stakes later on puts you in a worst spot where as winning a medium pot doesn't put you in that much better of a position.
Sorry if I wasn't very clear hope this helps.