The implementation of the grip strip doesn’t seem well thought out, well except for those making money off of replacement cleats. A friend, who likes the keo pedals, went to Look’s keo touring shoes with its recessed keo cleat after the same problem you’re experiencing, she also had a clipping in problem when the grip strip started to wear. No problems now either clipping in or walking with no need for cleat covers and with a long cleat life.

I use carnac shoes with a recessed cleat and they work well with my speedplay pedals both on and with walking comfort off the bike. I bought two pair, now on the second pair and wish i’d bought a third since they no longer are available.