whoops i meant hand 4 when i said 5...i will edit

in hand 1 your hand is really really under-repped. you played like you had a flush draw. it's a limped pot and a worse K is very likely.

also, in hand 2 you are forgetting that turned flush draws will call your bet (limped pot and checked flop makes this a real possiblity), and i think you are underestimating how often a 7 calls.

and it sounds like you already know that hand 4 was a bad bad fold.