You know I (personally) think it's a type of cage thing. I used to have guineas when I was younger and they were in a hutch in the kitchen. The hutch had a dark section with a door (standard hutch!). The guineas always used to leg it for the dark bit, I'd go through the ritual of opening the bedroom door, then they run into the tube.. and I'd bring them out via said tube. I had them nearly 4 years and they never got easier to catch. Eventually I would just leave the hutch open for them. They would come out for play time on their own accord and when they were done they pulled the hutch door closed with some string so the water bottle came back (I never taught that.. very impressed when I saw the first time!)
The cage I have with my current 2 girls is open plan indoor. They have a wooden house, and in one corner is a blanket pulled over like a tent top.. but they NEVER run when you pass them and I can virtually climb in the cage to clean them out and they dont budge. I even had Leeland look up and lick my chin one time.
I completely advocate providing hides and security, 100% so don't take me wrongly when I say the next bit.. but I think that if you provide any animal (even humans) the opportunity to hide, it will be more convinced the world is scary. If it settles out in the open and experiences sounds and light and people it will become desensatise more readily. The balance is in creating enough hide space so that it will always feel secure, but also to provide enough stimulation (and reward!) when they are out and about. I dont like hutches as much because I think they are too enclosed and dark with one panel of EXPOSURE where all the activity and stuff happens. Bit too concentrated I think for an animal with a nervous disposition.
When I get my girls out I have two covers for my bed, one has a large pouch and the other is basically a throw. If they have the pouch they will run in it and stay there. They wont budge, they wont poop.. they are completely silent! If I put them on the fleece, they talk, they eat, they scamper and explore. They pee on me
![smile :) :)](https://cdn.jsdelivr.net/joypixels/assets/8.0/png/unicode/64/1f60a.png)
I tend to end up bringing them up to my room on the fleece first and then when they look like they are settling down I bring out the pouch for snuggles. It's the only way I can guaruntee a range of healthy behaviours from them.
Of course, everyone raises their guineas differently.. and each guinea has a different personality! But the point is to make the world less scary.. If you are finding that your guineas are not getting any more easy going after all this time and it really bothers you that much, perhaps you could try them in an open top indoor cage (if you have the means) for 2 months and see how things go! Providing several hides at either end can help a guinea feel less trapped aswell!
Good luck!