I wonder if it just feels odd to you because of the difference between the free float and the pedals you tried initially. I've never had my Frogs unclip on me while I was riding, and that is pedaling both seated and standing (and that is including my accident last year - a neighbor who saw me down on the side of the road said that I was still clipped in!). And remember, there is no feeling of unclipping since there is nothing you have to push your foot through to unclip - it's a simple no-pressure movement.

One suggestion - can you put your bike on a trainer and experiment with the pedals? To start with just move your heel to the outside and lift to see exactly where the release point is? Maybe just seeing and feeling where that is while you aren't moving will solve the problem for you. Hopefully your foot's normal peddling position isn't such that the Frog unclips!

--- Denise