So I am about 15,000 miles after my timing chain replacement and when I went and adjusted the valves for the second time since changing the chain I went and ahead and checked the chain stretch cause I was curious where it was at. It is back at about 6 degrees off now. Is there anything else I should be looking at? I changed the tensioner spring when I changed the chain. Is there a good way to determine if maybe a guide is worn or should I consider installing a offset key. Just a note when I put it all back together after running a new chain in it was maybe 1 degree off or just a little less. Any input would be appreciated.

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1982 300D