I wrote this then I didn't click submit... sooo a little late but it's about LP range not necessarily being the top of the % bet/limped/raised

CO and BTN are exceptions as it's the perfect position to steal blinds and isolate limpers. If you're on the button, a passive player limps and CO raises, and you know he's capable of isolating then you can lower your 3-bet range and generally not give him too much credit. Same if it has folded to him and the blinds are not too loose. But you have to realize that some people especially at microstakes are completely unaware of position, so I would not vary my play too much in these situations unless you have a solid read.
It would probably be a better idea to maybe take note of that, but not trying to exploit it so much below 25NL.

The most important things at the micros are discipline, bet sizing and hand selection. Trying to learn and use too many concepts at once is doomed to fail. Try becoming aware of these things. I would suggest you still fold AJ from the bb to a potential steal raise, but try to put the players on a range when you are not in a hand in these spots and see how you're doing.