Waxless Fischer country crown grip

I am skiing with 200cm Fischer waxless country crown skis
and weigh 152lbs.

On Dec 8 I was skiing Hubbard hill in New Hampsire and
my skis climbed well. The temperature was 30 deg F.

On Dec. 16 I skied the Kilburn Pond loop and the skis gave
little or no grip leading me to take them off and walk some
of the steeper portions of the trail. The temperture was 22 deg F
that day with 8 to 10 inches of powder snow.

What can I do to make these skis climb better? Is the poor grip
a chacteristic of this ski? The grip pattern is cut into the base
of the ski. Can you put grip wax on this ski and not spoil
the waxless grip when the temp gets to 32?

George in New Hampshire