I think I've finally got my power steering woes resolved. I started by taking a baseline temp reading. On jackstands, I brought the car up to temp and cycled the steering with no load. As the engine warmed up, I noticed the steering pump just starting to groan at about 150 degrees. Hot, but not THAT hot. I brought the car fully up to temp until the radiator fans kicked on at 180 degrees. I took another steering fluid temp reading and the fluid was 167 degrees. The pump was groaning with no load when I cycled the steering.
I came to the conclusion that the fluid temp was not the culprit for the groaning because the fluid was simply not hot enough. However, I felt the temps were too high for a no load test (especially since I will be tracking the car). So, I went ahead and bought a cooler. I went with a 13x5" stacked plate style cooler and made a bracket out of 3/16" 6061 aluminum.
I used the nylon braided hose with AN hose fittings for the low pressure cooler lines. I love the nylon hose. It is so easy to use and doesn't mar up paint like the stainless braided hose. Here is the final config with the Chase Bays baffled reservoir.
Since I didn't think the temps were causing the groan, I swapped fluids from the Royal Purple synthetic to good old GM power steering fluid. I ran the same test again and the peak temp was only 118 degrees. That's a 50 degree difference with no load on the system! The pump is now also whisper quiet.