Sorry, not the best description! The bit of trim underneath (the surround around the heater dials) needs to be properly in place to 'push' the thin strip of trim along the bottom of the stereo fascia up. On yours it looks like the edges are meeting up but it looks to me like the middle is a bit low? The only other fix is to pull the headunit out and start again with the fascia, but that will be a fair amount of hassle. I suggest leaving for a few weeks and let everything settle and see how it looks then.
As for BOSE speakers, once you see them you'll wonder why you didn't change them sooner! BOSE are nothing but a marketing company that stick their name on other manufacturers stuff. Alpine, JL Audio, Genesis, Focal, Hertz etc all knock them into next week when it comes to sound.