I had a similar problem so I took out the recirc valve and replaced i t with a forge blanking plate plus a bailey dump valve, now its holding boost but the boost pressure is not as high as it should be, on my old 855 it was around 16 psi and off the scale on the boost gauge, so im thinking that ...

I have 3 ecu's, 2 standard and 1 remap and after having worked or fixed anything on the engine I replace the ecu, I also let the car totally get to operating temp before driving with the fresh ecu.