Always being called down - advice on opening up game

[Pomtidom]

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Ultimate Bet No-Limit Hold'em, $1 BB (5 handed) Hand History converter Courtesy of PokerZion.com

Hero ($99.50)
SB ($229.55)
BB ($124.30)
UTG ($19.50)
MP ($94.30)

Preflop: Hero is Button with 8[img]/images/graemlins/heart.gif[/img], 6[img]/images/graemlins/heart.gif[/img].
<font color="#666666">1 fold</font>, MP calls $1, <font color="#CC3333">Hero raises to $4.5</font>, <font color="#666666">2 folds</font>, MP calls $3.50.

Flop: ($10.50) A[img]/images/graemlins/diamond.gif[/img], 3[img]/images/graemlins/diamond.gif[/img], T[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, <font color="#CC3333">Hero bets $7.5</font>, MP calls $7.50.

Turn: ($25.50) A[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, Hero checks.

River: ($25.50) 6[img]/images/graemlins/spade.gif[/img] <font color="#0000FF">(2 players)</font>
MP checks, Hero checks.

Final Pot: $25.50

Results
Hero has 8 [img]/images/graemlins/heart.gif[/img] 6 [img]/images/graemlins/heart.gif[/img] (two pair, aces and sixes).
MP has 9 [img]/images/graemlins/club.gif[/img] 9 [img]/images/graemlins/spade.gif[/img] (two pair, aces and nines).
Outcome: MP wins $25.50.


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If I see stuff like this happen I always take a note: "C/c w/ 99 on ATx" and start 2nd barreling them a lot more. No way they are going to call 2 barrels with an underpair, and even if they do you make an other note and you decrease your cbetting frequency and take them to valuetown.