The pics are great and they are growing so fast. It seems like every morning when you look at them their feathers have changed.
When the weather was nice Spiderman and Mary Jane went out to a pen in the yard when they were about 4 weeks old. They would then come back in the house in their brooder in the evenings. I think it was about 7 weeks old we let them out of the pen in the yard. We have a chain link fence around the yard and I had clipped their wings so they wouldn't fly over the fence. I think since your keets will be free range you won't want to clip their wings. I don't have that much experience with the guineas to reccomend 8 weeks or 12 weeks on being cooped up. You have a lot of area for them to run in and mine are behind the fence. I've read where people turn them lose for the first time and they walk down the road and they never see them again. That would be so sad to never see them again.
The pool noodles sounds like a good idea on the herding. My husband is a big help with the chickens, ducks and guineas. It's a lot easier when you have 2 people helping with the herding.
I'm not sure but I think as long as the poo is not yellow or green there should not be a problem Probably switching their food like that will make a difference.
Yesterday a wild mallard flew in the lot next door. Mary Jane and Spiderman charged the fence trying to get to it. They knew that wasn't one of our ducks and it didn't belong here. I think their turning into little watch birds. Spiderman is a lot friendlier then Mary Jane. He is the first to get on your lap and wants to be around you when your outside. Mary Jane lets you know not to pet her waddles she does like her neck rubbed but don't touch her head. Spiderman doesn't care where you pet him he just likes the attention.
Thanks for sharing the pics with us and hope you have a nice day.
Clay where are you? I miss you.