Preflop - With the two callers there was already $350 in the pot when you raised to $400 giveing people good ods to call. Should have raised to about $600
Flop - Nice bet, fist pump when he calls.
Turn - dont stop now. $1300 would have been about right, but he only has $925 so anything that puts him all in is good
River - Tough choice since a K is very likely. He should have thought the same thing so I'm surprised it didnt go check/check at river. I still think I would have called and then kicked myslef for not betting the turn (which he would have likely called anyway)

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