Extra cooling

[Yaristeve]

I am on the search for extra cooling for my 2011 3-door. I've googled the internet for a double row, all aluminum radiator and found nothing. I've searched YarisWorld for ideas and found that the general concensus here seems to be that the stock cooling is adequate for stock engines.

BUT...

I regularly drive to Las Vegas (from LA) in my Yaris. In the summer, even on relatively "cool" days of 100 degree temps, I find that the engine temps start to rise to alarming levels (about 200 degrees) going up the Cajon Pass and other hills; temps have even gone as high as 205 on the hotter days. I've had to turn off the A/C, downshift, and slow down to 65 and the temp stabilizes at about 195, still too hot for my taste since the normal engine temp is 181 degrees. Plus, it's almost suicidal to be driving 65MPH on I15 out there. I've gone to Vegas in rental cars and the temp needle in those cars never move.

SO...

I noticed that unlike most cars, the front fenders are part of the sides of the engine compartment so fender vents would actually be functional. If I were to drill a 3" (or so) hole in the top of the front fenders and installed vent louvers, would it do anything to help cool the engine? Anyone try something like it? Yeah, I know it might look "ricey" but if it works, I don't care what it looks like...

The car is a 2011, just hitting two years old in November. Has 54,000miles on it with all original coolant. Oil is changed every 3,000 miles.

OR...

Am I worried for nothing?

Thanks for any ideas/help...