[Sad womp-womp noises]
Well, I asked because it's caught out a lot of us.
You can add a rail-riser under the optic if you want to stick with the MI-7 - and I'd consider it, I've not come close to fogging mine, which is a first. We've just had a post in the "wut made" thread here of a huuuuge riser. Whatever works works.
The other option is, quite seriously, to lop off the parts of the mask that are getting in the way. Actual customisation.
Or leave it as-is and use it situationally. I use my MI-7 with pistol or MP5K at CQB sites or even on a game-by-game basis.
That's the grip safety, hateful things. I just taped it down on my AEP 1911. I was actually thinking of this... bit. Sorry, I don't speak hi-capa, I've just seen a couple of owners swearing at theirs.
Nothing to worry about, pretty much all airsoft toys have a quirk or foible. Specna Arms like to blow the front off of their gearboxen, for example, although your CORE might not have the suspect Orion box, and mine's been fine.
It sounds like you have realistic expectation of the costs and foibles though, so just laugh it off, patch it up, concentrate on the next day, and it's all good.