99 Full house-- slowplayed too much??

[Str8Fish]

This is from the Crypto site, so here's a ghetto version:

Hold'em FL ($1/$2)
Hero is SB with 9 [img]/images/graemlins/heart.gif[/img]9 [img]/images/graemlins/diamond.gif[/img]
Preflop:
UTG raises, all fold to Hero, Hero calls, BB folds. (5 SB)
Flop: 9 [img]/images/graemlins/club.gif[/img]4 [img]/images/graemlins/spade.gif[/img]A [img]/images/graemlins/heart.gif[/img]
Hero Checks, UTG Checks
Turn: A [img]/images/graemlins/club.gif[/img]
Hero Checks, UTG Bets, Hero Calls. (4.5BB)
River: 8 [img]/images/graemlins/spade.gif[/img]
Hero Bets, UTG Raises, Hero 3-bets, UTG 4-bets, Hero Calls
Final Pot: 12BB

-When UTG was raising and re-raising, I knew he had an ace, but I wasn't sure if his kicker had hit. Otherwise, I would have kept reraising. I could have kept reraising in the FL game until I was all in.
-I have no read on him either.
-I thought since I was alone with one opponent, slowplaying was the best strategy to get more into the pot.

Anyone play it differently?