Have seen mentioned fuel pressure stated by S & S as 58 psi. Your measured pressure sounds way too low. Could you try another fuel pump?

FWIW fuel injectors are spec'd as: 34.8 lbs/hr @ 3 bar fuel pressure.

Richard

2018 Roadster 3.7
1966 Land Rover S2a 88
2024 Royal Enfield Guerrilla 450
1945 Guzzi Airone