I would bin the bleed valve as they are crap imo, get an electronic boost controller and make sure the actuator is not weakened in any way, you will see it hold boost much better and also spin up a lot quicker

Speak to Vince @ cr turbos (01425638426) say Raj @ autoflock gave you their number. He always gives me sound advice, my old escort which was on mfi used to spin up a lot better before I had a bleed valve fitted, even though the car bosted more after fitting it I gained a lot more lag.

Hope this helps Chris