If you had the bike fitted, one would assume that the fitter addressed upper body positioning, including hip angle and torso/upper arm angle. IF those things were addressed and changes made to get the angles right, then don't mess with the fit until you have a couple thousand miles on the bike. Different bikes handle differently. A lot of that is that different geometries deliver different responses to rider inputs. The bike should be able to teach you what rider inputs it likes and what it doesn't like. IOW, you'll get used to it. I sure wouldn't make huge changes in my fit like that - and those are huge changes - without going in for a refit, that is unless I thought myself a better fitter than the pro at the shop.
__________________
Results matter