Fuel cut

[Silver2]

Is there anything else that can cause boost/fuel cut, besides a jammed wastegate.  My wastegate is now free but im still hitting the fuel cut due to excessive boost.  
Can the actuator controlling the wastegate fail?  Ive just had the exhaust done and im running a 3" dump and 2.5" system.
I have wired open the wastegate and it will not boost, but here's the weird part, when i hook up my bov it will over boost with the wastegate fully open.  The vaccum line for the bov is hooked up the fuel regulator line.