I am using the Pro-extender but it is a bit uncomfortable at the base and where the strap is on. The head freezes out too.
Can someone recommend a good and comfortable extender please?
I would recommend you keep your pro-extender and mod it either with a vacextender head or a DIY velcro mod. As far as the base goes I agree with with ectospasm. Once I got more conditioned I found base pain was no longer an issue and I stopped using a base pad.