Should I have raised 5th or 6th?

[BTirish]

7 Card Stud High ($3/$6), Ante $0.25, Bring-In $1 (hand converter)

3rd Street - (0.67 SB)

Seat 1: xx xx T[img]/images/graemlins/spade.gif[/img]___folds
Seat 2: xx xx A[img]/images/graemlins/club.gif[/img]___calls
Hero: 5[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/spade.gif[/img]___brings-in
Seat 4: xx xx K[img]/images/graemlins/diamond.gif[/img]___calls
Seat 5: xx xx K[img]/images/graemlins/spade.gif[/img]___folds
Seat 6: xx xx Q[img]/images/graemlins/heart.gif[/img]___folds
Seat 7: xx xx 8[img]/images/graemlins/heart.gif[/img]___calls
Seat 8: xx xx Q[img]/images/graemlins/club.gif[/img]___folds

4th Street - (2.00 SB)

Seat 2: xx xx A[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img]___checks___folds
Hero: 5[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img]___checks___calls
Seat 4: xx xx K[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/diamond.gif[/img]___bets
Seat 7: xx xx 8[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img]___calls

5th Street - (2.50 BB)

Hero: 5[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/heart.gif[/img]___calls
Seat 4: xx xx K[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/diamond.gif[/img]___bets
Seat 7: xx xx 8[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img]___calls

6th Street - (5.50 BB)

Hero: 5[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/spade.gif[/img]___calls
Seat 4: xx xx K[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/heart.gif[/img]___bets
Seat 7: xx xx 8[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/diamond.gif[/img]___calls

River - (8.50 BB)

Hero: 5[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/spade.gif[/img] 5[img]/images/graemlins/club.gif[/img] 7[img]/images/graemlins/heart.gif[/img] 4[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/spade.gif[/img]___calls
Seat 4: xx xx K[img]/images/graemlins/diamond.gif[/img] 9[img]/images/graemlins/diamond.gif[/img] 8[img]/images/graemlins/diamond.gif[/img] 6[img]/images/graemlins/heart.gif[/img] xx___bets $5.25 and is all-in
Seat 7: xx xx 8[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/club.gif[/img] 3[img]/images/graemlins/diamond.gif[/img] xx___folds

Total pot: (10.25 BB)

Results:
Total pot $61.50 | Rake $2

Hero: [5s 5h 3s 5c 7h 4s 8s] (three of a kind, Fives)

Seat 4: [Th Ad Kd 9d 8d 6h 4h] (high card Ace)

I would usually raise 5th and/or 6th here, but Seat 4 didn't have enough to single-bet every street, and I didn't want to chase away the other player with a raise. I planned to raise on the river if Seat 7 had called--but he time-out folded. Is holding off on a raise because of a low stack that can only pay single bets to 7th in a multiway pot good reasoning, or exposing myself to risk too much?