Hmm, I had that problem once .....are you sure it is a squeeze?
Is it possible that you might have your foot pushed too far forward in your boot, and in turn forced too far forward in your fins, so that your toes are being crushed a bit?
Big, girlie, well cushioned socks sorted it for me.
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Sue
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"Life should NOT be a journey to the grave with the intention of arriving safely in an attractive and well preserved body, but rather to skid in sideways, chocolate in one hand, red wine in the other, body thoroughly used up, totally worn out and screaming ~ "WOO HOO what a ride!"
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The Blonde Mediterranean Mafia 
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Utina - Gozo