i use carapils a lot, so I'm not a naysayer from that angle, but i just wouldn't use it here.
along the lines of what Jim said, for me, amber is a nice blend of rich malty and caramel notes, perhaps some hints of toast or nuts and a balanced hops across the board - bitterness, flavor and aroma.
i personally just use 12% english medium crystal in mine - I would drop the carapils and definitely bump the crystal malt - may even reduce or eliminate the chocolate - I use 0.5% midnight wheat just to dial in the color I want, 3.5oz of chocolate there is going to come through rather noticeably - which may tilt this beer more toward a brown...