Blinds 5-5
Hero(CO): 950 (Hyper aggressive image, regular at the table. Have seen show some bluffs in the session. Raise a lot in position. Started the session with 400 and doubled up after an hour)
V1(UTG+2): 3500 (He is a retired millionare that always buy in for 4k when he sits. Is not a winning player, just plays for fun. Bets big when he has 2 pair or better. Just calls with draws or one pairs hands. Haven't seen him semi bluff with monster draws. 2 orbits ago he folded to me a value bet on the river when I had a flush and I suspect he had trips in a board 9 8 2 7 9. But I had seen him make some hero calls in the past with just one pair in dry boards. He is not scared of the money)
V2(HJ): 400 (no reads)

V1 limps, V2 limps, I raise to 30 with A3 of hearts

Flop goes: K J 3 (2 clubs and one heart)
V1 check, V2 check, I c-bet 65, V1 calls

Turn: 6 of hearts
V1 checks and I decide to semi-bluff again 115. V1 thinks for a while and calls

River: 9 of diamonds (doesn't complete any flush draws)
V1 checks again and I decide to bet 275 as a bluff and V1 starts thinking

Is this a good line for a bluff? Was my sizing good on all the streets or am I just spewing money on the river?

You're lighting money on fire. Make a hand, and value bet.

Considering the river card brings the most obvious straight draw and you barrel like you didn't notice, this is a bad bluff.

You need to consider what story you are telling. The only way a real hand would make sense here is if you had exactly Q T

Would a set/2pair bet this river (hand you are really representing until the river)? Possible but not likely.

I would check behind on this flop. With bottom pair it's not even clear if your bluffing or not.

On the river, I think your hand is too strong to triple barrel. Your ahead of his club draws unless they had a 6 or 9. If he had a made hand on the turn hard to get a fold on River especially if he doesn't care about money. I bet you're ahead of a lot of his folding range.

I'd rather have a hand like AQ or AT, but I think this line is fine. You are also going to have a stronger range than villain on this board.

So you're a hyper lag who has shown bluffs and he's a retired millionaire who doesn't fold? I'd say perfect spot to bluff.

Any 2P+ is absolutely betting this river. Maybe even hands as weak as KQ for value. I'm also not sure why we can't have other QT combos. If you're not betting sets just because one draw came in then you're missing loads of value.

I think bluffing here is a waste of good showdown value. Villain has to fold pretty frequently for betting to be better than checking back. We actually beat some stuff. Save the bluffs for hands like 54 or whatever.