Turn on gauge hijacking so you can see boost on the dash board (fuel gauge is my preferred position). With your mods, I'd expect to be hitting 15-16psi.
Ensure the car is warmed up, JB4 will target stock boost until up to a safe temperature. Mine take 5 or 6 miles to reach this temperature.. I have activated the flash hazards on warm up option.
Car: 2010 Jaguar XFR (Cat-back exhaust)
Gone but not forgotten: Highly Modified E90 335i LCI M Sport Manual (circa 480BHP/500lb ft)