My Hercules is a new in 92' motor, not rebuilt and it idles around 25 when hot and runs about 55 psi running above 2,100. It'll hit 70 psi at idle when cold and about 100 psi under throttle when cold. For reference but a completely different motor, the C12 in a Brand New MTVR only has about 15 pounds at idle when warm and that's considered "normal" as well. As long as the bottom end is not knocking, I wouldn't worry too much.