Instafold Top set? Standard?

[kokiri]

~115BB stacks, $1 BB, 6 handed. Villain had been fairly tight and predictable. Comments on all streets welcome. Is this standard?

I open in MP with A [img]/images/graemlins/diamond.gif[/img]A [img]/images/graemlins/heart.gif[/img] to $4.
CO reraises to $12. Folded round. I flat call.

Flop: $25 A [img]/images/graemlins/spade.gif[/img] J [img]/images/graemlins/spade.gif[/img] 6 [img]/images/graemlins/spade.gif[/img]
I bet $18, villain calls

Turn: $61 A [img]/images/graemlins/spade.gif[/img] J [img]/images/graemlins/spade.gif[/img] 6 [img]/images/graemlins/spade.gif[/img] T [img]/images/graemlins/spade.gif[/img]
I check call $25

River: $111 A [img]/images/graemlins/spade.gif[/img] J [img]/images/graemlins/spade.gif[/img] 6 [img]/images/graemlins/spade.gif[/img] T [img]/images/graemlins/spade.gif[/img] 4 [img]/images/graemlins/heart.gif[/img]
I check fold to $58 push

I call preflop rather than reraise which would obviously be simpler because villain is fairly straightforward postflop so I thought I could get more from him with a little disguise.

I mulled folding the turn but I figure I'm stacking him if the board pairs. River is a clear fold? Standard - teaches me just to pump the pot preflop and not try to get clever, kick myself and move to the next hand?