Short update on mine: Went to start the turbines (JC Cheetah) and realized that the 4mm main fuel line was putting too much resistance and could not achieve full power. My setup in the fuselage is with the UATs is in front of the tanks and the ECUs in front of the UAT's. There is a 4mm bulkhead festo in the fuselage where the nacelles connect, and from them it goes to the turbine. The combination of distance and height differential is too much resistance to flow.
So will be increasing from 4mm to 6mm from the ECU to the turbine. Will also increase the kero start line from 3mm to 4mm. I don't think I need to increase the ECU fuel input line from 6mm, but will see.