You won't have any problems with the ATA length. I've taken two does and a buck out of a treestand with no issues. Also taken a turkey and an antelope out ofa Double Bull T2 blind. I didn't notice the extra length as compared to my Allegiance.

Brace height shouldn't be an issue. I haven't had any accuracy issues and the last couple weeks been hunting in a coat and no issues with string slap.