No problem with the position of the weapon.
No-one shoots
exactly the same anyway anyway. My standing position is conventional in appearance, but I know people who push away from their body against a tight sling, people who have the butt near the middle of their chest, and they are national-class shots (I'm not :-\)
There is no right and wrong way because everyone's body is built differently.
Like eagle infers, if you hold the weapon tight into your shoulder the base of the butt dissappears into your clothing.
Message to BAS from a lurker - looking forward to release of these excellant models