Whenever I cast a mind blast while I have a mastery proc up (and obviously I had an orb) I refresh dots (assuming the proc wasn't up the last time I cast those dots). Also, will recast the Dots just before the buffed ES is going to go away (be it through running out or I am about to overwrite it with a non-buffed ES).
If you are lucky enough to have ES always up you can refresh your VT/DP 6 seconds before they end without losing much (if any) DPS, Also don't let your DoT recasting interfere with your Mind Blasts. DO NOT let your DoTs fall off.