I performed fuel flow testing. The good news is that the fuel flow is more than the engine requires with minimal fuel, the bad news is that it is 130% instead of 150%.
With 10 gallons in the tank, I get 17 GPH, which is way more than I need.
While testing fuel flow, I was also able to verify that my fuel flow sensor is very accurate.
I contacted the builder who's fuel system I copied, and he said that he thougt I was fine, and that with the engine running, the vaccuum in the intake would help the fuel flow as well.