Yellow injectors are standard and I am suprised your car even runs. If your running high boost your car must have had a remap as otherwise you will not be able to see that boost. Basically by looking at your spec you should have 3 BAR MAP sensor, uprated injectors typically greens and a chip and an uprated actuator.

The injectors as with all the components are specific to your software and can NOT just be hot swapped so be sure you know what your software is programmed for then buy the correct injectors for that chip. If you dont have this information on paper best bet is to remove ECU, dismantle and look at chip and it is usually stated on this.

Your MAP sensor is 3 BAR as you said you run 1.5 BAR of boost and a standard 2 BAR would not be able to see this.

Does it run ok on boost as it must be running lean at the moment which will destroy your engine.

The switch just cuts the boost control valve power and hence you can run lower boost.

As for the leak have you checked all seals and made sure breather is not clogged?

Martin