Worth to get more radiator space?

Hello,

I am currently building in a InWin 909 case. What would be your opinion on the impacts of installing an additional 240/280mm rad to a 1x360mm & 1x280mm build?

The current components are a 5960x overclocked and a 1080 overclock with a second one in december (& tubing rework).

Would it be better to add the radiator or just use fans for a better airflow?

Thank you