So I have a pair of shoes that I believe I've broken in well (a few hours a week for the last ~4 months). When I walk it's very uncomfortable and sometimes even painful. The pain is knee pain I was going to be insoles but wasn't sure if it would make a difference. Any tips? They're rubber-soled if it makes a difference. Also, the leather seems really stiff. The shoes are corrected grain, but other CG shoes I've had haven't been this stiff.