Your temp is fine. But if you are really concerned i wouldn't change your airflow. You say you got a nice airflow yes? If you want the temp to lower you are better off getting a aftermarket active cooler for you graphics card. ( this does mean removing the stock cooler, getting rid of the thermal paste on the gpu, applying new paste and new cooler. So depending on your experience with these things, something to think about. Or asking a computer savvy friend)
Lower temp means it runs stable and it leaves room for overclocking. OCing a graphics card when its already reaching 80 degrees celcius is not a good idea for stability. If it tops at 80 degrees on full load and you don't plan to OC then its fine. Accept when you get artifacts or stability issues then its a good idea to think about better cooling.