When you get dealt K2o or J3o - that's nothing to write home about. This deep (like 15bb) forget NASH charts - they are only relevant for push/fold game (and we are playing min-raise/limp/shove/fold game here).
So don't expect miracles when you hold K2o at 15bb deep, but let's try to do our best to squeeze as much EV as possible.
- So no NASH, no shoving k2o (that's just a spew).
- Min-raising is putting too much money into the pot and we have a hand that is not very playable (no flushes or straights in the near future and hitting 2 will produce only a bottom pair, hitting K will produce top pair with the weakest kicker).
- folding - you know what? We have only one villain and we are in position! Villain could have 72o, T5o, 42s - so often times our hand is best hand preflop and on top of that sometimes we can muscle villain out of the pot even if he happens to have a bettor hand. So folding is giving up our fair share of the pot. Folding hands is more suitable for full-ring scenario, but in heads-up, we are forced to play even subpar holdings.
- limping - sounds great - we put minimum amount of money into the pot, but we are in for a play! Yes, sometimes villain shoves and we have to fold, sometimes he iso-es and we fold, but often villain will just checks, checks again on the flop and now all you need is just a little small stab - and oftentimes the pot is yours. Limping is the best play, but the most difficult - because there will be lot of postflop play. But how else to learn the postflop play other than by playing postflop and getting experience?
So limp, limp, limp most of those hands from the original question and best luck at the tables!