I have my toe set to about .05 degrees toe-in, and caster is set to 90' specs, but I will play with them a bit.
I drove the car all over the place yesterday and it worked great so far, the rack seems to be happy with this pressure. I can steer as fast as I want and it feels the same, no weird stuff. I can't find anything about a pressure relief valve in the rack, I think those are only used in older recirculating ball type steering gear boxes.