Many thanks for the input. Just to be clear, I have never thought about limping AK and probably never will (I will 4b or shove AK nearly all the time).
About this example, I will have lost 3bb + a
pot size post flop bet if I check/fold after his flop called (presuming he hit the Q). I am down 8 bb within 2 orbits and it takes me forever to get back up to break-even.
Try to stay away from pot sized bets. You will only be up against strong hands and lose A LOT of value from hands you have dominated. 1/2 to 3/4 pot is your friend 
If I play "my game", adjusting to villains, I will win the occasional blinds here and there, but only like 2-3 times until someone calls and the above scenario hits again, I am back down if not even lower. And hypothetically, if the J hits the flop this second time around, Vil will most definitely fold to my cbet.
Seems a little pessimistic. Just stick to ABC poker at 2nl. Make sure you are betting for value and not to get folds.
So all my standard 3x bb raises PF and cbets seems to be a losing strategy. You see my point? And playing very tight, never playing marginal hands, will only cause my villains to fold asap when they see me enter the pot.
Same as above. I kno it seems frustrating to get folds and take 3c-14c but regardless it's money in the bank. Wait til you get to 100k hands and you will see how beneficial those small pots were. And when you are looking for tables you should be very aware of the avg pot/hr. Stick to the juiciest games you can find.
I build pots preflop and I fold when flop is not in my favour, and I lose money long term. I do fold TPTK when necessary.
At 2nl, the point is to build the pot preflop when you assume you have the best hand. So bricking the flop might be losing your original raise but it should be significantly out-weighed when you are playing for value with monsters and hands you don't brick. (again, don't bet pot cuz this will limit value)
How do I solve this?
