Having two monitors shouldn't make the card overheat. What do you have for case fans , what size and how many? Do you have a fan in the side panel of the case that would blow onto the card? If you open the side of the case and position a fan to blow onto the card do the temps go down?
It is probably just your case design, my card blows air onto the gpu and then the air gets trapped in my case until it slowly goes out so my card gets up to about 68 degrees, even though I have a card with dual fan cooling and very good heatsinks, but its mainly the axial fans to blame for that, but anyways, 72 degrees for your card should be fine, unless you start noticing performance issues which i dont think will happen because of the temperature, but if you WANT to have the card be cool, do what i do, I use my very nice headphones when i play games because they make game sounds AMAZING, and you cant hear much around you, so when i do that i set my fans to 100% they are loud and keeps it cool, but i cannot hear them while playing a game because of the headphones, i paid about $100 for my headphones