Bypassed the rear heater with a Gates 5/8" diameter hose that's about 12" long and has a 90* bend formed into it. I searched Mud and found this idea, it works perfectly. The heater valve was also replaced.
Things were going so well I decided to eliminate my not so old PHH by running a single hose from the head up to the heater valve. And since that went so well, I decided to swap the water bypass hose (#1 I believe) that runs from the bottom of the throttle body down to the head with a newer one off my spare engine. That little hose replacement was a big pita!
I also installed a black hub fan clutch that I filled with 15k oil to replace the black hub clutch I was already running with 10k oil.
When I refilled the cooling system, after a bit of research, I decided to stick with a 50/50 coolant mix but this time I dumped in a bottle of Redline water wetter.
On a 25 mile drive at speeds between 65-75, AC on and AC off and ambient temp at 105f I never got above 205f on the Koso temp gauge. Turning the AC off decreased water temps by no more than 5f and slowing to 65 made very a minimal difference also.
Last year I overhauled my cooling system completely, installed the previoulsy mentioned fan clutch, 50/50 coolant mix and no water wetter. At 105F ambient air temp my water temp went as high as 219f under the same conditions.
No doubt the fan clutch is now more agressive but the water wetter is the mystery snake oil. Redline's testing showed an 8f drop in water temp. I was pleased with the lower water temps I was seeing no matter what caused it.