Are either of these well played?

[VickreyAuction]

Off-tempo checkraises don't come up much.

BB is 62/10/.9.
UTG is unknown.

PokerStars 3/6 Hold'em (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#666666">2 folds</font>, <font color="#CC3333">Hero raises</font>, BB calls, UTG calls.

Flop: (6 SB) 6[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, UTG calls.

Turn: (4.50 BB) 8[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
<font color="#CC3333">Hero bets</font>, BB calls, <font color="#CC3333">UTG raises</font>, Hero calls, BB calls.

River: (10.50 BB) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">BB bets</font>, UTG calls, <font color="#CC3333">Hero raises</font>

The idea is that UTG didn't raise the river, so he's got an 8 or worse, and BB wouldn't have played a 6 this way. So I'm ahead of both, so I raise. Good?

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Button is 18/15/3 over 90.
UTG is unknown.

PokerStars 3/6 Hold'em (5 handed) Hand History Converter Tool from FlopTurnRiver.com (Format: 2+2 Forums)

Preflop: Hero is SB with A[img]/images/graemlins/club.gif[/img], A[img]/images/graemlins/heart.gif[/img].
UTG calls, <font color="#CC3333">MP raises</font>, <font color="#CC3333">Button 3-bets</font>, <font color="#CC3333">Hero caps</font>, <font color="#666666">1 fold</font>, UTG calls, MP calls, Button calls.

Flop: (17 SB) Q[img]/images/graemlins/heart.gif[/img], 3[img]/images/graemlins/spade.gif[/img], 3[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(4 players)</font>
<font color="#CC3333">Hero bets</font>, UTG calls, MP folds, <font color="#CC3333">Button raises</font>, Hero calls, UTG calls.

I didn't 3bet here because I don't think I'm ahead of button all that much. I cap pre and lead the flop into 4 people. Raising the flop here with AQ would be very bad IMO. I thought he wouldn't raise it with KK either, but now I think he sometimes does. From his POV, my range should be about AhKh, AQ, TT-AA after I bet the flop.

Turn: (11.50 BB) 5[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(3 players)</font>
Hero checks, <font color="#CC3333">UTG bets</font>, Button calls, <font color="#CC3333">Hero raises</font>

He just calls the UTG donkbet, so QQ and 33 are out. So I'm ahead of button for sure. My question is, is UTG ahead of me too much for this raise to be good?