The base of the peniz and PE

How important is the base of the penis in the progress of natural enlargement , im doing stretches with tight silicon sleeves and im very surprised about how my penis is reacting , im placing a 3cm sleeve at the base and a large one at the mid of the shaft , i want to know if the sleeve im placing at the base actually helps when it comes to stretch the penis or has a negative impact , im wondering if its better to let the base free of stuff or actually pressing the base would make a kind of traction work like a extender which as far as i know its used for lenght.