My husband who is bowlegged also had knee issues when he went clipless (his knees would swell up at mile 20 on flat road). He went to a Certified Bike Fitter who shimmed his pedals. With the shimmed pedals, wearing soft knee sleeves, and taking Motrin before biking, he was able to complete 36 miles with several Category 5 hills today at more than 15mph (including the hill time). Ask the Certified Bike Fitter, but probably a pedal with a larger degree of float is good for you. Hopefully, there is a certified bike fitter close to your house. If not, it's worthwhile to do the drive.
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2012 Specialized Amira Elite, upgraded carbon handle bars, Jett saddle 143mm switched to 145mm 2012 Selle Italia Max SLR Gel Flow saddle

2011 Specialized Ariel Sport,suspension post,Serfas Rx Women's Microfiber saddle