Sounds like pump is bad or squirter is too small. If you can visually see the pump working, I would go up to a 31 squirter and see how it likes it. tune the squirter size from there. Air gap has a lot more area than stock manifold. I run an air gap, while I have a 360 with a large cam in the heat I run 31 and 37 squirters and when it gets real cool I have to go up to 42 and 45's on a 750 but this is race only.