Hello,
Usually your higher cbd strains are going to counteract some of the more negative effects of thc...like any racing, anxious feelings. You can definitely cross an all cbd plant with a high thc plant and slowly grow and sort the seeds for the traits you like. Otherwise a nice option is rolling joints that are partially cbd flower and high thc flower.
Either way I definitely prefer a little cbd in my grows to help mellow the high thc.
Happy growing.