i am not very good but just want to share my experience, read card plus betting pattern plus tells,
tells can't know here, so
1st case is ok
3rd case is wrong play, being reveiwed already,
2nd case may have chance to reduce the loss,
SB bets $1.75, may steal the pot but can call $6 raise means has something in hand
after flop SB check, may hit or not, if not hit anything, only a small bet can bet him out, only a few player or very experienced aggressive player can use weak hand to call reraise and to bluff after flop,
after flop SB hits, you bet $11 will surely make him reraise all in you,and you can't run for pot-committed,
so we study his hand first, pocket Ks is not big chance because he will reraise or all-in you preflop, then it may be a poket pair bigger than 9 and up to Q to call the reraise pre-flop, Qs or Js is the biggest chance, if not pocket pairs, the chance to call is AK, then AQ, if not then suited connectors
so after flop JQ7 rainbow, the biggest chance to reraise you all-in is set (this reraise will not expect you to flod because you are pot-committed already, so it is a real hand) or open-end straight draw (but it is not worth for heads up play), or AQ or JQ suited (this 2 cases has less chance),
so my comment is : after flop can bet less and flod with a reraise all-in fight back