Cap 6th and/or raise River?

My opponent was fairly aggressive, but didn't seem stupid. I thought when I raised him on 6th that I was indicating "I can beat aces up," so I decided to proceed cautiously when he reraised me. Opinions?

7 Card Stud High ($5/$10), Ante $0.50, Bring-In $2 (converter)

3rd Street - (0.30 SB)

Seat 4: xx xx 4[img]/images/graemlins/diamond.gif[/img]___brings-in___folds
Seat 5: xx xx 8[img]/images/graemlins/diamond.gif[/img]___raises___calls
Hero: 2[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img]___raises

4th Street - (4.70 SB)

Seat 5: xx xx 8[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/heart.gif[/img]___calls
Hero: 2[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img]___bets

5th Street - (3.35 BB)

Seat 5: xx xx 8[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img]___bets___calls
Hero: 2[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img]___raises

6th Street - (7.35 BB)

Seat 5: xx xx 8[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/spade.gif[/img]___bets___raises
Hero: 2[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img]___raises___calls

River - (13.35 BB)

Seat 5: xx xx 8[img]/images/graemlins/diamond.gif[/img] 4[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/spade.gif[/img] xx___bets
Hero: 2[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] 9[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] K[img]/images/graemlins/spade.gif[/img] 3[img]/images/graemlins/heart.gif[/img]___calls

Total pot: (15.35 BB)