Your instinct to not get nasty is a good one, nastiness will be counterproductive. Just keep it to the facts and leave emotions out of it. Yes, include copies of your notes as substantiation for leaving early. Also, by giving 30 days written notice, maybe luck will be on your side and your vacancy can be rapidly filled. Even if there is no time when the unit is empty, you will likely still lose your deposit.

IF you opt not to pay additional rents due till the unit is re-rented, and IF they send you to collections for rents owed, that will show on your credit report. That is a scenario that makes it much more difficult to secure a future rental. The worst scenario of all is leaving the property and it lands it court and a judgment is secured against you (in addition to loss of rents, they shell out $$ for repairs or there is damage to the unit.) Property judgments are a landlord's biggest red flag: I've only encountered two but they were rejected right off the bat. Their side of the story had no impact. If a court issued a property related judgment, that applicant is just too risky to take on as a tenant. Those are usually more extreme cases, the one I had was where the applicant abandoned the property in mid-winter while landlord was out of town, pipes in basement froze and burst, landlord came back to an empty- and very dirty-house with a flooded basement.)

I know this stinks, but only you know what type of people management are. Rather than bail out altogether, for your own future record, can you sit down with management and request a move to a different unit that would be more tolerable until your lease is up? You're only looking at another 4 months. Although you sound very unhappy and 4 months could be an eternity, it would be a shame to jeopardize future years of renting if you could somehow find a way to hold out till your lease is up.