Bus service from AKL/V, always gets bad reviews for what reason, I DONT KNOW.
We've had nothing but good experiences..That being said, you already have the MK & AK days covered, which would be the longest if reversed(Obviously) Other than that, you really aren't going to gain or lose too much with whichever you choose TBH.
From AKV, HS might be a tad bit shorter by a couple mins. then going to Epcot, and also coming from BRV, Epcot would be a few mins. closer than HS...Take that FWIW, but when on vacay, a few mins here or there arent' going to change my vacation...As Sleepy said, stick to the EMH's or just to the park hours (Opening times/closing times) as well...The day you plan on going might be a early close day, for a specific park..