Mabuchi - 50 Deg F is not too cold. Thats CS22GL with Paragon weather. We get those conditions during winter races in Florida.
You will only need foam in the CS22's when it get in the 40's or lower....that's when you have to have a transmitter mit or your fingers freeze and you cant feel the trigger/wheel
The guys in the UK and Europe run like that all the time in late fall and early spring.