[Peleus]

The blinds are so low at this level vs average pot size its not worth trying to defend them this much.

Secondly the 3 wouldn't be a card that would let me fire a second barrel. You could be against some type of over pair, perhaps he spiked the 9, or he just doesn't believe you and is calling down with a J. What would he call a massive (vs pot) sized bet that a 3 would change? If he is on a flush draw it seems he is calling you down no matter what you bet. If he thinks his J or whatever is good on the flop, a 3 won't change it.

I don't think his check is a sign of weakness, merely letting you get a big club and whack yourself over the head with it betting yourself to death.

Check / Fold to aggression on the river, I personally wouldn't make that type of move again. You can make so much more playing ABC poker, and with a lot lower risk / variance.