Top Set, Bad Slowplay?

[jsnipes28]

Table Table 36766 (6 max) (Real Money) -- Seat 2 is the button
Total number of players : 6
Seat 1: sky20 ( $75.7)
Seat 2: howser21 ( $89.75)
Seat 3: borko6 ( $164.7)
Seat 4: i3ond008 ( $64.2)
Seat 5: slips28 ( $103.95)
Seat 6: FTPickle ( $72.5)
borko6 posts small blind (0.5)
i3ond008 posts big blind (1)
** Dealing down cards **
Dealt to slips28 [ J [img]/images/graemlins/spade.gif[/img], J [img]/images/graemlins/heart.gif[/img] ]
slips28 raises (4) to 4
FTPickle folds.
sky20 folds.
howser21 folds.
borko6 folds.
i3ond008 calls (3)
** Dealing Flop ** : [ J [img]/images/graemlins/diamond.gif[/img], 4 [img]/images/graemlins/spade.gif[/img], T [img]/images/graemlins/club.gif[/img] ]
i3ond008 checks.
slips28 checks.
** Dealing Turn ** : [ 8 [img]/images/graemlins/diamond.gif[/img] ]
i3ond008 checks.
slips28 bets (7)
i3ond008 calls (7)
** Dealing River ** : [ K [img]/images/graemlins/heart.gif[/img] ]
i3ond008 checks.
slips28 bets (12)
i3ond008 raises (35) to 35
slips28 calls (23)
** Summary **
Main Pot: $90.5 | Rake: $2


Is this a bad check on the flop. Should i maybe overbet the flop. I guess by checking he decided to call a gutshot on the turn whereas if i bet the flop and the turn he probably wouldn't have called two relatively large bets for a gutshot. I called his river raise, questionable, and he showed AQ the straight.