Power Steering problems

[watkinsg06]

I recently had a new power steering rack installed in my 92' svx. VIP said it diddnt pass inspection even tho it used to work fine. The problem is that whenever i take turns at slow speeds the power steering does not work, but when I accelerate it works fine, this is forcing me to take turns at a higher speed than necessary. could it be the fluid they used? not using dexron atf? could that be the problem? because when ever im driving the car at a constant speed it works fine but if i take my foot off the gass it is very hard to turn the wheel. VIP said they have no clue what could be causing this. Before i take it in again is there anything that I can do? I also have ecu stage 1 chip installed, maybe that is causeing some sort of malfunction with the new rack? any help would be very much appreciated thnx.