theoretically if you set to A2 you can introduce a little more of a draw bias and that should reduce backspin rpm. this should be easy to experiment with if you have access to a launch monitor.

but generally I think shaft profile would impact spin more

How do you actually know it spins too much

Short and right answer; See a qualified fitter.

Longer and possibly totally wrong answer for your swing, attack angle, shot shape etc; Going to C2. Reduction loft will lower your spin (all other things equal), but you risk missing your window if your dynamic loft is too low and you don’t have the speed to compensate. Not much benefit in dropping 1k spin if you’re losing 2-20 yards of carry (depending on swing speed and current launch angle).