This stuff goes on like butter if you reduce it right. You worried me with what you listed as your reducer. You don't add catalyst to the reducer. You take the C-V right out of the can. Catalyze it as directed on the can and then add reducer.
Xylene works good.
MAK should be great. You are right about temperature. You should not use C-V under 68 degrees F, as the catalyst will not activate. C-V loves hot weather. The problem is the temperature at which you are spraying.