Well, to start with that is really not the way to change fluid as if you were lucky you replaced about 30%....so if it is contamination causing the issue, you really didn't accomplish much. To change fluid, using your baster, drain the fluid from the reservoir, then disconnect the return line to the reservoir....run the line into a container for collection and cap off the bottom of the reservoir. Fill the reservoir with fluid and have a friend start the engine, refilling the reservoir as you go and having the friend turn the steering wheel full left and right....ok, your done. I would also recommend using mercon V as it has better lube properties.