Its nice to know that the AGA-T has the room to do this...
have you found that the wick pulls up juice as you are filling?
have you tried this with a solid/tight wick?
When I do it this way, it's ready to vape the moment I finish. I do it with a very tight wick, (500 mesh, about 90mm, rolled SOLID). Tiny bubbles will percolate out of the top end of the wick as I fill, and a bit of juice will collect in a "doughnut" around the base of the wick. As soon as I stop filling, the doughnut typically absorbs back into the wick, and I'm ready to rock.
I also use an empty juice bottle to suck juice back out of the tank if need be in the same manner. It's not that I hate syringes....I just can't find any of mine right now, and haven't had another order since I got my AGA a week ago.