JC Alvarado's Pre-flop Aggression Not Working Out

Hand 1:
With blinds at 100-200, the player under the gun limps into the pot, JC Alvarado raises to 450 from middle postion and gets callers from Dan Harrington on the button, the small blind, the big blind, and the utg limper.

The flop comes [10d5d3d] and it gets checked around to JC who leads out for 1,200. Harrington calls and the small blind check-raises to 4,500 which gets everyone to fold.

Hand 2:
On the very next hand, a player in early position limps into the pot for 200. Alvarado again makes it 450 to go. The button, who just took the last pot, calls as does the big blind and the original limper.

The flop comes [10c9s4d] and it checks around to the button who bets 750. Everyone folds except for Alvarado who makes the call. The turn is the [4s] and it goes check, check. The [Ac] comes on the river and Alvarado quickly leads out for 1,600. The button makes the call. Alvarado tables king-high while asking “is that good?” and he gets his answer when the button shows [AsJd] for a pair of aces.