Flopped straight, turn brings 4th diamond

[mblax10]

Playing in a juicy live 10-20 game. We've had a full table most of the day but are now 4 handed. SB is TAG, not afraid to raise the hell out of beatable hands at a full table. I've been hyper-aggressive, running over the table since we went short-handed.

I've been chopping with SB all day, but we decided not to chop once we got 5 handed. This is the first time it's folded to villan's SB since we decided to stop chopping. Since we are heads up the entire hand, their is no cap on raises.

Live 10/20 Hold'em (10 max, 4 handed)

Preflop: Hero is BB with Q /images/graemlins/heart.gif J /images/graemlins/spade.gif
2 folds, SB Raises, Hero calls

Flop: (4 SB) A /images/graemlins/diamond.gif, K /images/graemlins/diamond.gif T /images/graemlins/diamond.gif (2 players)
SB bets, Hero raises, SB raises, Hero raises, SB raises, Hero calls

Turn: (7 BB) 7 /images/graemlins/diamond.gif (2 players)
SB bets, Hero calls

River: (9 BB) 5 /images/graemlins/spade.gif (2 players)
SB bets, Hero calls

Final Pot: 11 BB

Is my line ok? Did I raise too much, not enough on the flop? OK to call down after the 4th diamond on the turn?

I don't see how you could possibly raise the flop anymore than you already did, unless you're opponent is a real nut. It seems to me he either has a set (which necessarily means he has no diamonds) and is afraid of your flush draw, or mostly likely he has at least a straight, probably with a diamond (if not a royal flush). I could also see an aggressive player raising from the SB preflop with a hand like Q/images/graemlins/diamond.gif9/images/graemlins/diamond.gif. The only thing you could possibly beat is a set, in which case he still has 10 outs to river a boat. I'd probably fold the turn. What could he possibly think you had on the flop? Surely he's worried about the diamonds too, unless of course he already has them.