[MadScientist]

I don't like the first one. You could be shown two pair on the river two often that he "should" have folded.
I like the second one with you read that he is weak though I think if he flat calls flop, you need to carefully reevaluate on the turn and check behind sometimes instead of just barrelling ahead with bottom pair. If you pick up any draw or make a hand, it will be easy. Also, betting any card J-A should be profitable too.
If he was SB or button and not BB, I would think your play to not be profitable without a stronger read.