I have a 2.5 HP, 2 speed pump. What speed should I be running it at for normal operation? Also, I ran it on low speed and my PSI were only about 3 or so and the water was coming out of the return at a decent clip. Running on high speed, I was around 13 PSI and the water was rushing out of the return. Both of those figures seem low. Thoughts anyone? THANKS!!'s