I'm in MP with AQss and a passive player who has demonstrated he can raise early and C/F flops if missed has raised to .20 and I decide to call. I felt like he folded his weaker hands to a raise and was unlikely to call with worse, so seeing a flop and playing post seemed solid. A passive player calls behind and one player in blinds comes along.

UTG - $5ish
Me - $12ish
Button - $3ish
blind(don't remember)

Flop
KJ3ssc

blind checks
UTG leads for .60 into .83 (he obv has top pair or better)
I can't raise for value, but I have too much equity to fold, so I flat.
short guy shoves, other guy calls, making the pot 7.99 and I have 3.50 to call. I may have the stack sizes a little off but the point is it was 3.50 to win $7.99 and I have 44% equity. I made the call but I believe that was a mistake because of the potential redraws for KJ/33 making a full house.

Can anyone help me out with numbers/advice

12 nut outs, not folding.

Not too concerned with how it works out from the flop, just get it in and try not to worry too much about results, because 3-handed it's definitely a +EV play.

Grunch

Gii I even raise flop

Use poker stove if you want to know equities

I downloaded pokerzebra(I have a mac) but am confused on how to enter the hands properly? care to elaborate?

Do you think there's anyway preflop should've been a raise for value or is the flat fine?