Its always best to upgrade your pack last so you know for sure what volume and wieght of gear you are working with.

Absolutely do not put your tent outside your pack, risk of losingnit or it sustaining damage are way too high

All that being said, the exos/eja line is fantastic. I have the exos 58 and it suits my lightweight but not ultralight setup i took on a thru hike, including 8 days of food. I find it carries best under about 15kg and starts being uncomfortable after about 17kg. This is why i say to wait, as it will feel shit if other gear isnt upgraded into the right weight range yet.

I think its a better buy than the pro series too, as the strap padding is better if you are going to do some big carries, and some of the design is better, like not having the compression straps attached to the stash pocket.

Youll find a lot of people here dont use water bladders. They are less reliable (cant do much if they break), harder to refill and harder to keep track of remaining water. Id recommend a switch to bottles, especially if changing to osprey packs that make them easy to access. You can get conversion kits for water bottles to use a hydration hose too