driver's side boost leak?

[shallowshowcase]

i upped the boost to 15. i can hit it just fine, but when i hold it at 15 at WOT it starts jerking steadily and sounds like a boost leak but on the drivers side. what might it be? i soapy water boost leak tested my car with no leaks before i upped the boost.

 

[ddavisaf]

How long have you been running 7's in your car? Have you pulled them yet to see if they're fouled?

Run a boost leak test at 20 psi, how long do you hold it for?