[vector1]

your overflow tank is incorrect, the inlet from the header tank (what you term recovery) should go into the bottom, invert your overflow and open the bleed for air or take it out completely and insert a barb with another hose to bottom of chassis for overflow.

unless the inlet to the overflow has a tube inside that goes to the bottom of the container, then disregard. but you still need an air bleed on it.

actually, putting a header tank on the pressure side is a bad design,........ but everybody does it.