Hey there, so a couple things - you really shouldn't need to mist that much unless you are having issues retaining humidity... in theory, he should be fine with 2-3 mistings a day for a duration of 2-4 minutes. An automatic mister, such as a Mistking, makes this a very feasible thing to do. There are other tools you can add to this, such as a nighttime fogger, but that's a tool that is contingent on a few factors. You can use a dripper during the day for an hour or two to supplement the misting schedule. Definitely want to make sure there is enough surface area for him to drink from - lots of plants, leaves, and branches.
Check out this for a guide to hydration: chameleonacademy.com/basics-hydration-for-chameleons/ (sorry, I couldn't get a hyperlink for this - maybe someone else can post it here, or you can just copy & paste it into your search bar)
Additionally - the fecal does not look typical. Is this how they've been looking lately? I would encourage you to take a fecal sample to an experienced exotic vet for testing.
Here is a thread that you can look through to maybe gain some insight from other people's posts regarding atypical fecals:
https://www.chameleonforums.com/threads/chameleon-poop-101.120171/