Do you have the street pump or track/performance pump? I am using a remote reservoir on my systemI have only had my system on for a couple months so far, I have the TCP power rack and the KRC pump with integral reservoir. I do not have any noises under normal circumstances but I do when ever I get to full lock in either direction - it makes kind of nasty squeal noise.
I had the car on the track for a few sessions last week and didn't experience any issues with noise or foaming of the fluid. I am using the NAPA brand power steering fluid which is what I believe was specifically recommended to me somewhere along the way as it has different properties then some of the other chain store non-synthetic brands.