It sounds like the PSC box is a good upgrade, but that leads to new pitman arm, which can lead to new center link etc... I would rather buy once, cry once, than piece meal parts which might now match / work well together. Thus, the questions about the different center link designs.
The red head went on with a psc pump , lml booster , gas truck cooler and synthetic ps fluid. Im now at 112k miles and just swapped the redhead for the hd PSC XD steering gear and have 34.5" tires. I still cant turn lock to lock when at a stop but i can turn more than i could with the redhead. The trucks steering now consists of Lml hydrobooster
PSC makes a heavy duty box. They're proud of them, but my buddy that put one on his LMM dually with oversized tires on it says it drives and turns better than stock.
Nothing beats PSC's box and pump. The pump puts out higher flow than the GM pump and their box is the only actual upgrade over the OEM box. The internals in the PSC box are bigger (shaft, bearings, gears etc).
We only use and install PSC boxes in these trucks. The PSC boxes seem to hold up the best in terms of tightness and the steering effort feels reduced compared to an OEM box.
Ive seen really great results with ATF+4 in Saginaw systems in jeeps (stock parts, AGR, PSC, ghetto rigged setups...) the ATF+4 always reduced steering effort and never boiled over. Just looking at published numbers, the redline ATF C+ may be the best fluid out for power steering.