Sorry I am tired so not energy for being pc.
You sound like you do not have a clue. Your poor dog.
All the behaviours you describe are of a stressed bored dog. You are lucky that the all he is doing is pooing.
Chewing, bolting, refusing to wee poo out on walks etc are all behaviours you would expect to see in a dog that is unhappy.
So you need to do a lot of things to make this work.
Get a trainer - work on recall - you need to be able to let a collie off lead. If this is too much effort (!) then you need to find a safe area where you can let him off lead.
He needs to be stimulated in the day - a lot, get a clicker and find a trainer that uses a clicker for training. No need to be amazed at dogs emptying the washing machine your dog could learn this in under two minutes with a clicker.
I would crate again at night - I would also split the food (which I hope you will change) into two meals a day. Easier for the dog to digest. I would also throw away his food bowl. He needs to work for his dinner. Get him to start with to follow your hand and then hand feed him. If he will follow your hand you can teach twists, spins, walking backwards, walking around (even if you do not want to use a clicker) He will be tired out and relaxed from his training.
You do need to increase his stimulation, without doing this you will have a very frustrated and unhappy dog.
Join a local agility club, go to obedience classes, they are in daytimes ad evenings - if you have an intelligent dog you have to use his brains.