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Sounds like you need a better chain, that is a lot to stretch in such a short period of time.
Is that the original manufacturers chain?
If so it might explain why they went with a 520 chain on some models.
I usually get somebody to bounce on bike,while I put my hand on a portion of the chain that will not catch my hand, and try to collapse the suspension to see if there is too much tension on the chain with a load on, don't want to go over a bump and have the chain becoming a stressed member of the frame.
Generally with a load on it you want to feel a little slack but not have the chain taught and rigid, feeling like it's being stretched.
Not an expert but I play one on the internet........ :wink:
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