Are you doing suwari waza on mats? If not, it probably will hurt your knees.
I remember doing a course with a japanese bloke (can't remember his name as it was a good few years ago) and he expected us to do suwari waza at the same miai as standing techniques. This meant you literally leapt using your knees - very difficult at first but it made standing technique seem like a breeze.
Ian
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