I am looking at reducing the nozzle size on my seadoo pump in an attempt to reduce rpm and increase thrust. The pump is being run on a GPR conversion.

Whats the smallest nozzle size anyone has run that has yeilded a speed increase and/or rpm drop. I'm talking about a custom made ring smaller than any Riva/R&D etc available. Currently running 80mm but thinking of going down as far as 72mm then working back up. Holeshot not important, chasing top speed here.

Duke?, guys?, any input.