I agree that you should avoid mixing the CGD with outside products, like baby food. It will throw off the balance.

If they are eating from your fingers, you can be sure they are eating from the bowls. It can be hard to notice, especially since the CGD is watery and will evaporate over time, making it even harder to know if they ate or not.

What type of food bowl do you use? What flavor of CGD are you using?

For additional feeding tips, you can try asking on the Rapashy Superfoods forums. http://www.superfoods.repashy.com/

You only ever really notice the big poops when you feed them crickets. I now my new little guy is eating because I put 8 gut-loaded cricks in his enclosure tonight and he was hunting them around 12AM.

If your geckos seem to be losing weight, or they are not growing fast enough, you can supplement their diet with gut-loaded crickets once per week. Toss in about 8-10 small crickets after gut-loading them for 24hrs with the Repashy insect gut-load, and remove the CGD overnight.

A final suggestion:
Repashy makes a flavor-pack that contains one CGD 'base' and then several flavor supplement packs. You mix the base and flavor in a 1:1 ratio, and then add 2:1 water. That way you can offer a variety of flavors. Maybe you will find one they enjoy more? Read more about it on the Repashy website.

I hope this helps!