Cut alot out? ya..now imagine doing it to fit 3-3.5" piping!
It looks to me like the other nipple on the BOV is another spot to get your vac signal from..ones above the diaphram, the other is below. works well for EBC's i believe. you should be fine with it as is.
adding a FMIC won't fix any fuel cut issues..air to the motor is air to the motor. However if you moved the maft any bit, or have no more boost leaks cuz it is all properly installed, that could help
-A. Swift