.50/1 stud/8 - jamming like a lunatic

[RubbishCards]

Seat 7 is a complete lunatic. No read on seat 5.

7 Card Stud High-Low ($0.50/$1.00), Ante $0.05, Bring-In $0.25 (converter)

3rd Street - (0.80 SB)

Hero: 5[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img]___calls
Seat 2: xx xx 9[img]/images/graemlins/spade.gif[/img]___folds
Seat 3: xx xx 2[img]/images/graemlins/heart.gif[/img]___brings-in
Seat 4: xx xx T[img]/images/graemlins/heart.gif[/img]___calls
Seat 5: xx xx 7[img]/images/graemlins/heart.gif[/img]___calls
Seat 6: xx xx T[img]/images/graemlins/spade.gif[/img]___folds
Seat 7: xx xx 8[img]/images/graemlins/club.gif[/img]___calls
Seat 8: xx xx T[img]/images/graemlins/club.gif[/img]___folds

4th Street - (3.30 SB)

Hero: 5[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/club.gif[/img]___bets
Seat 3: xx xx 2[img]/images/graemlins/heart.gif[/img] J[img]/images/graemlins/heart.gif[/img]___folds
Seat 4: xx xx T[img]/images/graemlins/heart.gif[/img] 9[img]/images/graemlins/heart.gif[/img]___calls
Seat 5: xx xx 7[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img]___calls
Seat 7: xx xx 8[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/club.gif[/img]___calls

5th Street - (3.65 BB)

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

6th Street - (6.65 BB)

Hero: 5[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/club.gif[/img]___bets___raises___calls
Seat 5: xx xx 7[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img]___calls___calls___calls
Seat 7: xx xx 8[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/club.gif[/img]___raises___raises

River - (18.65 BB)

Hero: 5[img]/images/graemlins/club.gif[/img] 2[img]/images/graemlins/spade.gif[/img] A[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/heart.gif[/img] 3[img]/images/graemlins/club.gif[/img] 5[img]/images/graemlins/diamond.gif[/img]___checks___raises___raises
Seat 5: xx xx 7[img]/images/graemlins/heart.gif[/img] 2[img]/images/graemlins/club.gif[/img] J[img]/images/graemlins/spade.gif[/img] 6[img]/images/graemlins/club.gif[/img] xx___checks___calls___calls
Seat 7: xx xx 8[img]/images/graemlins/club.gif[/img] Q[img]/images/graemlins/club.gif[/img] A[img]/images/graemlins/club.gif[/img] 4[img]/images/graemlins/club.gif[/img] xx___bets___raises___calls

Total pot: (30.65 BB)

I guess everyone will tell me to raise 3rd.

On 5th I was going for a checkraise to drive out the other low, but then he was the one who bet - wtf?

On the river I figure there is no way seat 5 will pass up a bet when I check to him if he made a 6 low. Am I okay to jam after he checks behind (and subsequently cold calls 2 bets), given the small risk that seat 7 could scoop with perfect hole cards?