Play smooth nine or draw to the seven?

[Deveroast78]

On my usual poker site I find players staying in with tens and jacks or drawing up to two cards going to the river and frequently can win at showdown with even a rough eight, but get frustrated often because the fish just keep drawing on every street and by the time the hand is over, they're showing a nine or better too often for me to make a serious profit. My question, specifically, for 2-7 Triple Draw players out there is this: Do you think with a four-card nine (say, 9, 7, 4, 2, X) I should draw two to the seven or one to the nine, going into the river? Should my decision differ depending on how smooth my draw is? I know I should draw from the bottom up but I have trouble laying down a hand like 9, 7, 4, 3, 2 and can't get a good EV to tailor what kind of hand I should be showing down with. I figure the average best hand to be approximately a smooth ten 3-way and a jack heads-up, but a lot of times the fish stay in to the showdown and end up sucking out with an eight, usually when I've already invested too much to NOT call the river bet. Any suggestions?