Just watch your temp gauge and stay out of 5th gear.
If you start to get too hot, slow down. Otherwise, drive at the speed limit or a little below. You also have the option of dropping down another gear and racing the engine for a little bit. I have 3.73 gears and can drive 70MPH in 3rd gear. The 3.0 will take that just fine all day long, too. The increased RPMs will allow for a higher fan speed, plus you'll be moving more air through the engine itself. Both effects will increase the rate at which your engine can shed heat.
Adding another fan really won't help. Don't switch to all-electric fans either. You'll have less ultimate cooling capacity after spending that money.
Will's hand-slap theory is backwards--you aren't concerned with the temp of the hands, you're concerned with the temp of that hot surface. Blowing air slowly over a hot radiator core will get that air hotter, while blowing air quickly over a hot radiator will not get that air as hot. But in the second scenario, you have such a larger volume of air, the total heat transfer is higher.
Also, if you have a CEL on, fix it. Some conditions that turn on the CEL will also contribute to running hot.
I find that if I stay in the right lane on the interstates and highways, there's enough traffic to keep me going slowly enough to not have any heat issues at all. And FWIW, I've wildly overloaded my little pickup during Texas summertime and the temp needle settled at very slightly warmer than 1/2, which is where it usually stays. But, of course, it's pretty much flat here.