Looking at this thread again, I noticed that I never posted a update on my Cabernet problems, the man to the rescue was @jslateiv
He helped me find the problem by the pictures I had sent him, it seams two solder joints were not soldered at all, and because the wires used are very stiff it was not easy to spot, I had never soldered before, but with good help from jslativ, I was able to get it done, so now my gain control knob works perfectly.
So all is good, being able to adjust the gain has improved the sound somewhat as my power amp has a lot of input gain.