I don't see a problem with that. The minimum is probably printed in part to avoid people risking rim damage, and even if you're light you don't want to go too low, as it's much easier to suffer tire or rim damage.

P.S. On a new bike it's important to make sure your seat position is proper before deciding on the stem. Assuming your position on the Madone is dialed in, if the Symmetry has a different seat tube angle you will require a different saddle rail position on the post to have equivalent position over the bottom bracket.