You may find that using the leg lifters helps with the cramping. Some of us have found that they help with keeping our feet from getting numb.
I like the backband well enough that I went out of my way to get one for my home built boat. Have you loosened the rear straps, so that when you pull the main straps, the back band actually comes forward as it tightens?
Kayak Carrier Kits
Full Size Sail Rig
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