After you mix the food, dab a bit on your finger than dab a bit on the mouth of the gecko.....they will 99% of the time lick off the little bit you dabbed on. This is a good check to make sure.

Do you notice it drinking when you mist?

Also, you may want to make an order of a few different "flavors" of Pangaea or other mix. I alternate my "flavors" once a week, but a few of my geckos go crazy over particular types.

You can also try some banana or other baby food. The baby food should ONLY be used as a treat or to help animals that need a kickstart. If you feed the baby food all the time, the access sugars will lead to obesity.