Thank you for the pictures, I've always wondered about the Grande Aura.Thanks. I second guess myself at both extremes on size. The smallest I like to go is Zhoe legend with rear pocket and the Athena is pushing my comfort level at the larger end. Midi Theia, Grande Aura, and midi Angel seem to be the sweet spot for size.
There's also the Luna & Calypso if you like crossbody bags. They should be around the size range that you like.
You could give the Angelica a try. It is about the same size as the Athena but slightly smaller because the Athena has a big front pocket and the Angelica is slimmer at the top.
For softer leathers like pebbled, you can ask Marco to add more backing to make the bag more stiffer.