I am by no means a rubber guard player but do read alot and remember Kruzy had a post awhile ago about knee pain and it was posted in there that i believe no time should your foot be closer to your head that your knee is I might be wrong but if thats the case it looked to me as that your pulling your foot down to you when in mission past the line of your knee again I might be wrong just hoping it might give you something to look into. I will try to find the link and post it for you if possible.