Do smooth anatomical implants exist?

Shaped devices and texture go hand in hand.The purpose of texture (in the case of shaped implants) is to prevent device rotation. In contrast to round devices, shaped implants need to maintain a particular orientation within the pocket. If a round device rotates, it is still round. If a shaped device rotates, it no longer conforms to the classic tear drop shape.
The texture acts as a sort of "velcro" allowing capsular in-growth and holding the orientation in place. For this reason, shaped implants are always textured.
Textured devices also have a lower rate of capsular contracture, however, when placed submuscular the difference is negligible.With regards to your particular situation, a shaped device will deliver a more gradual slope when placed above the muscle (the downward pressure of the muscle across the upper pole of the device essentially converts round submuscular implants into shaped devices; studies have shown that when placed submuscular most cannot tell the difference between the devices post op).
As always, discuss your concerns with a board certified plastic surgeon (ABPS).

Thank you for your important question.  Unfortunately all anatomical breast implants are textured.  That is why the wall of the textured implant is thicker so it is strong enough to maintain the anatomical shape.  Smooth-walled implants are only available in round.