I think waxless skis really, truly suck unless you're on melting snow. Even then, these are the only waxless skis I'm aware of that pretty much ever test faster than a well-waxed ski:
Fischer Sports - Nordic Ski Race Classic - RCS Classic Zero In general, the difference between well-waxed skis and waxless is like the difference between a Veloflex tubular and a 1 1/4" Kenda K35 clincher - it's huge.
It's not necessarily bad for your kick wax to be picking up a bit of snow on the kick. As long as it's coming off on the glide and you're not icing over, you're okay. What wax were you using at -7C, and what was the snow like (new, old, dirty, clean, etcetera)?
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