Playing live today and after being up and down (from 9k to 29k) was on about 19k with blinds at 800-1600.
I am in BB, when UTG +2 (female that seems weak/passive limps in), all fold round to old geezer in SB to my right who makes up (SB is serial limper who i've raised off pots a few times after he's limped- he seems to like his marginals) and I look down at

. I want 4800 in pot without any confrontation so bet out 4000- anybody disagree with this bet?? surely I shouldnt check here??
UTG + 2 as expected folds but SB calls my raise- flop comes

giving me open ender and overpair- SB bets out 4k- into 12800 pot?

?? whats my play- is this an automatic ship it in- seems a weak bet.