When you say you can see the fuel squirting into the primary throat, are you sure that is not just the accelerator pump and the primary circuit is actually not working? Would think that you should only see a mist from the primary venturi not a squirt.
Will idle because the idle circuit is seperate circuit but when you crack the throttle it will lean out as the accel pump shot dies out?
It still does the same thing when the turbo is removed from the equation, lid removed from carby, etc?