I think your wrong on that or looking at it the wrong way. What you calculated as target flow rate is what the flow rate that nozzle will produce with the chosen pump plus any restrictions before it. The idea is to take advantage of the pumps pressure just before it can no longer over come the back pressure which is not much based on what I found out. Even at my 1/8th nozzle I still see signs of pump cavatation. Use the pump outlet to go straight to the block so there is no restrictions before the block. Keep the inlet of the pump as less restrictive as you can.
Check out the Little Giant 5MDSC compared to the one you got now. The 5MDSC is made for pressure applications.
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