Small unsuited broadways preflop - some questions

[Isura]

Looking over some HH's from my last 8k hands or so, I've noticed that I might be limping too much with these hands.
Questions:
All these hands are in MP2+, typical 33/5 loose-passive game.

1) KJo with 1 limper
2) KJo in MP-LP with 2-3 limpers - I limp, is a raise standard?
3) QJo with 1 limper
4) KTo with 1 limper
5) KTo with 2-3 limpers
6) QTo with 1 limper - I fold, should I raise. limping seems yucky here.
7) QTo with 2-3 limpers

I think I'm limping a little too much. I usually fold if the early players are tight, and limp if they are loose (in most of these situations). Is raising for value more appropriate against loose players?
I find myself in constant tough spots postflop when I flop weak top pair or second pair. Generally do you guys like to raise more and take control of the hand? Thanks.