Too aggressive with my underpair or SOP?

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Chesspain I think your post-play here is interesting, in particular the turn. This type of aggressiveness I have not been able to fully incorporate into my game yet.
What are you trying to accomplish by c/ring the turn. Is it value betting or are you trying to scare a jack out of the picture?
In the long-run do you feel your hand will be good enough times to show a profit with that one overcard on the board with three other players seeing the flop?
Do you change your play at all if that one over card is an ace or king?