Need the skinny on the skinny

Howdy Folks,

I am trying to put a twist into a plastic solid.  I'm about 90% where I want to be.  Can you please show the error of my ways?  I can't seem to keep my 'thickness' even through out the twist.  I'm using the Boundry Boss/Base rather than lofts (because they just work better).  But I'm hung at this last 'twist' in my intent.

Many thanks.

Carter

SolidworksParts And Features