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I cant tell from your post if you replaced the guide on the chain tensioner. If not you want to check that one as well. The chain tensioner guide can be easily replaced without removing the timing cover.
Also you reported a Febi tensioner. I have heard recommendations from a reliable source on this sight that only the genuine MB tensioners should be used. I have no experience with this myself. I generally don't replace tensioners with a timing chain unless I feel there is a problem. I replaced my chain at 100,000 and now I'm just starting to hear the morning rap, maybe I will reconsider that.
As far as your theory left cam dragging might be a reason for both the left sprocket to get pointy as it will cause high tangential loads on the left sprocket. The right sprocket would only see higher radial loads and force the chain to ride lower in the groves and not wear to points. Replacing the cam sprockets sounds like a good idea. Mine were also pointy at 100,000K and I felt the I would have liked to replace them if I had the money.
Glad you found your cracked rail on time. I'm starting to feel that only genuine MB guide rails should be considered for this engine. Its to expensive a problem if it screws up and they aren't that expensive. Let us know if you find a source for metal rails.
For my black car I am seriously considering pulling the engine and trans. Pulling the chain cover and replacing everything under it as a preventive maintenance. While I have the engine out I can seal up everything and detail the engine and engine bay.
I have found that the only problem with having 2 107's is that you have to work on 2 107's.
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