I'd say the most important thing is that you are mucking around with this now, and figuring out and troubleshooting the hiccups well in advance.
In my private message, I mentioned reading often about how its really better to have multiple files that arent too large, and one would think the ACA stuff is divided into chunks that work properly without issues on common devices that people use.

I'm sure there are forums for the ACA route that you could find some real life user helpful hints also.

On long trips, I've always found it handy to have a few days planned out in advance, so even with modern technology, I like having even just notes down on what town I'm getting to, what grocery store I've seen is there, or whatever. Basic note planning a few days in advance is nice to have and easy to keep on top of.
On rest days, I've always gone over my bike thoroughly and also looked ahead a bit to be clear on the general routing--I like not always to be "peering at a screen" or at least to have a "bigger picture" thing in my head or on paper for the next few days anyway. Its also nice to always be a bit ahead of the route game, so you dont have to go over everything each night, especially if you are tired and just want to get camp set up, showered, your clothes cleaned and hung up to dry, eat supper and get all your crap organized in the tent for the morning departure.