I was thinking about offering you $20 to $30 for these used pedals and then I looked and saw that these pedals sell for $180 or more. These pedals should be some very nice pedals.
If you can reduce the tension on the hold in of the clips to the least amount and then practice clipping and unclipping while your bike is on a training stand. You should be able to get the motion down so that you can unclip easily. I like to unclip when my foot is at the top of the pedal stroke. After I stop with one foot on the ground I just crank my heel out on the other foot with the foot at the bottom of the pedal stroke.
I have been using some old look style pedals and I like them. I bought some very cheap nashbar look type pedals and I could not adjust them so that I could easily unclip so I had to really crank my heel out to get them to unclip. I only use the nashbar pedals on rare occasions.
If you decide to throw the cx6 pedals in the trash please send me a Private message.