Socketing Warm Blooded into Discipline makes DPS Drop

Basically what it says in the title. Socketing the passive support skill "warm blooded" into the skill "Discipline" (from the Stoic Sceptre) makes my DPS drop by about 300dps. I can't figure out why this is happening when there are no notes in the tool tips that would indicate this would be a side effect.

UPDATE: I can't delete the post but I figured it out. It is an issue of not having enough spirit to run all the support gems.