Yes mate that is what you need to do.
You need the pressure in the fuel bowl to equal the manifold pressure.
The basic working of a carbie is that the venturi effect caused by a change in carbie cross section of the air flowing through it resulting in a pressure differential between the fuel bowl and intake air (look up the equation for Mass flow of air - mass flow does not change nor does density as at this velocity it is considered a non compressible gas, so a change in cross sectional area has a resultant change in pressure and velocity), end result, fuel moves from bowl to mix with air due to the pressure differential. In NA cars the reference pressure is atmospheric (i.e little hole on top of carbie is vented to atmosphere and the only pressure change is the caused by the venturi effect).

However, in a blow through turbo situation the reference pressure should always be the inlet manifold pressure, this is because on boost the reference pressure changes as the inlet air is no longer base lined on atmospheric, as it is being compressed by the turbo. In this scenario if the fuel bowl pressure is left at atmospheric then you have a higher pressure of air pushing against the fuel, you may even see the fuel coming out of the reference hole on top of the carbie.

If the reference pressure between air flow and fuel bowl is maintained, then the only variable is the pressure change due to the venturi effect, this will result in the carbie work the same as NA, regardless of the reference pressure. The other issue here is fuel pressure, which I think you have already rectified with a raising rate fuel pressure regulator.

Sorry if it is overly technical.

Bryan