trancegodz
Fractal Fanatic
If you purchased the Axe FXII used I suggest that you start by installing the most current firmware and presets.I have just recently purchased an AxeFX III Mk I and so far I'm completely blown away by how muddy and fuzzy it sounds in my setup. When I tried out the Axe with the previous owner, and I'm pretty sure it sounded completely different.
Make sure you have the most current versions of Axe Edit and Fractal Bot.
If you don't like the stock presets, then create your own. Pay particular attention to choosing the ir that sounds the best to you, as a bad cab choice will make it almost impossible to get a good sound.
Preset from other people will not sound the same for you unless you have the same guitar and same pickups that was used creating the presets and demo videos of the presets.
What you are using to monitor your Axe FXIII with will color what you are hearing also. Poor monitors equal poor sound.
Like you, I also have the Beyerdynamics DT 990 headphones and they sound good.
If you are a new user be sure to check out the Axe FX Wiki. There are answers to almost everything you could think of .
https://wiki.fractalaudio.com/wiki/index.php?title=Category:Axe-Fx3