especially a bad idea if you think he is holding some kind of weak A or 2nd pair type of hand, because it will be hard to evaluate the turn. You don't know what will pair his second card and since you are oop this can be very expensive.

I think it would be much better to make this balancing play if you were on the button, as then you can more easily control the turn and river, making it easier to get to showdown for the right price.

You said he is folding flush draws to a lead here. if that is the case you should be abusing this guy. I don't think I've ever seen someone at 25 NL fold a flush draw on a flop HU though. Unless you are overbetting the pot by a significant amount this seems unlikely. and if he is, then this is a pretty big mistake on his part that is easily exploitable.