Tick "Buff", "Self" and also "Meditate" if you want your character to meditate when it runs out of VE. Still, you should meditate manually first on that specific map to enable the button.
When choosing the delay, you should make sure that Delay*NumberOfSkills>RecastTimeOfSkill, approximately. Casting time may also count. The idea id that usually the more skills you have selected, the lower chance of getting d/c, because casting the n-1 skills with an x delay should take more than the recast time of the nth skill.