+1. Exactly what Dustin said.
Best thing you can do is ducting and making sure your coolant is properly bled as well.
Create ducting after the FMIC and make sure that all the air is forced through the rad. Do you still have the factory grey “sponge” inbetween your radiator and the rad support? If not, make something up. Also, try getting one of those radiator shrouds that come on stock SR rads.
You could also try getting a NISMO thermostat if those thing’s don’t help you.
Fans don’t help you while you’re driving. When you’re idling or driving 10kph it does.