like someone else said, know your dog. they are all different. try things out and see what reaction they have.
I have been feeding Dexter an altered version of PMR for 4 years. he mainly eats checken drumsticks (meat is important in PMR and wings don't usually have enough meat for a proper diet) chicken thighs, backs, necks, beef and lamb and raw eggs are the main sources of meat with any sort of heats, liver, kidneys, etc mixed in there too. i feed with ocationally feeding duck, cornish hen, buffalo or elk. the main staple is chicken and poultry since those are the smallest bones and easiest for him to eat. he eats red meat without a problem. he won't eat raw fish, but i buy the dehydrated salmon treats and also suppliment with fish oils. the onbly other suppliment i use is probiotics. the only meat i don't feed is pork. pork is one of the only meats that can carry a parasite that is capable of killing a person. i don't eat it and its just a personal choice not to buy it for my kids.
i say i do avariation because i also feed chopped up veggies with chopped up meat or ground meat ocationally. dexter loves his veggies and i always have these sort of meals in bags in the freezer in case something comes up and i dont have the time to hang out while he eats. (he WILL hide the meat around the house of i don't watch him.
i also have Peppermint eatting raw meats and bone, but she is soooo tiny that i need to cut it all up into small pieces for her, so it's not technically PMR. cutting up the bone takes time, but to me its worth it. she loves it and actuially started feeding herself raw meats when she was a puppy by sneaking into dexters meals and trying to eat his food
one of the reason the PMR can be helpful to a dog's digestive system is because they take their time. their bodies are meant to take their time to eat, not gulping down a meal of kibble in seconds flat. they start with licking the meat which gets their digestive juices flowing and preparing their tummies for digestion. that is why ground meats aren't part of a pMR diet since they can gulp that down just as quickly.
good luck with your switch! let me know if you have any questions!