Bathmate Hydromax Base Enlargement

I was wondering if anyone knows how to get the base of my penis thicker using the bathmate, my base is about a half inch larger than mid shaft but after I pump midway up to the head is now bigger, it’s like it’s not affecting the base at all, I don’t use the comfort pad that comes with it, starting girth is 5.5 mid shaft and base is 6. After pumping for 25 minutes mid shaft is 6.5 and base is still 6.