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I think you may have the cables adjusted too tight. The shoes should sit on the block at the bottom and in the picture the swan necks should have no preload on them at all. The bottom spring should pull the shoes back to the bottom block. Are the shoes and the discs worn? Have you checked the wear limits on the drum? Your main adjuster looks as though its close to the limit - my new set up shows only 2 threads on the adjuster when opened out to just get the drum on, final adjsutment is only 1/2-1 full turn of the star adjuster.
Forgive me for being critical but the whole assembly is in need of some TLC with white grease to the contact points and I also coat the springs with a smear of grease. the whole thing should move smoothly, I can't see how yours can.
I had a deal of trouble setting the shoes on our set up but that was eventiually tracked down to a handbrake cable that had jump out of the quadrant guide at the handbrake end. Check this once and then again, again and again. (I only did 3 times)
As an aside, you can use BMW shoes instead of Porsche ones at about 1/2 price, they are identical.
Clive
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