Chain slap
Try lining up the countershaft the swingarm pivot and the rear axle. That should be the tightest point for the chain. That is where you should have some flex left in the chain, that is the chain should not be tight. Then check the whole chain for a point where it is tightest. Chains do wear unevenly. After checking the chain at the tightest spot of the chain at the tighest spot created by the countershaft, swingarm pivot point and rear axle then set the bike on the sidestand with your normal traveling load and see how much slack you have....that is how much slack you need in your chain. A couple of photos would make this much clearer, why don't you stop by when you are in montana USA and I will show you.
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