Hello pump guys - I have a new 3/4 horse Dayton convertible jet-pump. I have a Dayton ejector-kit which includes the cast iron ejector, four different sizes of plastic nozzle/venturis and a chart. The chart tells me to choose nozzle/venturi size that matches my motor hp. Choices are for 1/2, 3/4, 1, and 1-1/2 hp. Here is my question: If I want to maximum delivered water pressure, at the expense of some flow, can I choose an alternative nozzle/venturi size? The vertical lift from my cistern is just 10 feet. Horizontal run from cistern is 50 feet of 1-1/4 pipe. Thanks.