The adjustable pedals shouldn't make a difference. If you are hearing the "compressing air" noise when the engine is off, that is normal. The air I'm referring to in the lines you won't be able to hear.
If you replaced the rear pads and left the old rotors on, it may take a little time for the pads to break in. Once they do, you will probably feel an improvement in the brakes.
Also, typically if the MC is bad, the pedal will slowly go to the floor as the fluid leaks out. If this isn't the case, I would bet it is fine.
Remember to keep it in low gears when going down mountains and have a good trip!