Hi, sounds to me like somethings wrong somewhere in the steering head, I have never had this problem even with both panniers fully loaded + the gobi top box stuffed to the brim then adding two ortlieb bags full off stuff onto the panniers. the bike loaded like a camel has never had any form of tank slapper. is the front tyre pressure right and balanced,are the spokes tight,is the wheel buckled is the back wheel aligned and check the head bearing and finally try keeping a hold of the bars!hope you find the problem though cos it should not be happening. all the best brad
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