In my experience some adult candoia eat alot, & some very little. I had a Solomon Island ground boa a while back that only ate 4 meals in the 4 years I had it. As long as they are not looking too thin I wouldn't worry too much.

One thing you could try is feeding them a big Cuban tree frog, or a lizard of some sort. I know starting over on switching them back to rodents would be a pain, but that might get them eating again.

Dan