Can the restrictor size increase water psi or decrease. Running at 4500 rpm i have 15 to 20 psi on both motors anything above 5k and higher the water psi goes up as fast as the mph looks to max out the gauge.These are two fresh power heads one piece tuners 1/8 restrictors no poppet all new pans and gaskets updated part numbers from Mercury cross over hose from head to head cle big window four hole lowers.The only thing that i can think of that i could of changed was the size of the restrictor both motors are doing the same thing.Any help on this would be greatly appreciated. Thank You