Nobody can comfortably ride with both feet at 25+ degrees, thats inhuman.
Guess I'm inhuman. Yeah I was riding at 25 degrees and actually liked it. I've been talking to a mate of mine and he says he gets it on his obrien boots too but once they're broken in it goes away. Guess I just need to ride more.
There's a bunch of ways to heat mold. If you're near a shop that has a special machine to do it, go there. Otherwise a bath filled with water round 80 Celsius works too. Just get them warm, put your feet in and tighten the bindings. The foam will shrink in some places but also expand in others. I found the toe box way too big when I got them but now its almost water tight.