..... well if the fuel pump is uprated ... it could be you have reached the limit of the fuel filter. You could try putting a Y piece in the fuel line and running a pair of filters and if necessary later, running a larger fuel line to the rail .
on that FSE regulator you can, as with the other after market regulators, reset the fuel pressure manually. You can also monitor the pressure as the engine runs up ....useful info. What does the fuel pressure trace look like on your dyno graph ?
...so your regulator vacuum pipe is connected to the intake before the Vortech ? ... G..