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Interesting that a course impeler dont work and only does 3200 rpm!! What revs does urs do WOT mine does 4800!!!

I doubt changing the nozzle angle will make alot of difference.. to get it on the plane better you need to tilt up but the further you go the more steering you lose!!!

The ass will be boggingdown...

Scottrods teed it i feel.... sounds like 2 things... a is worn impeller and b is you really need more stages... im running same engine on a 17 &19 pitch ss tipped impellers 110mm nozzle and it goes...