Thanks again for your support and for sharing in the humor of the situation with me! Peeps--no offense taken. I wouldn't have believed it if I hadn't seen it myself. Okdfarms--I hear that same song! The only time our guineas can't fly over a fence is when it would make my life easier--LOL.
These guys are mischievous, but they have the sweetest dispositions and are very entertaining. I love to watch them forage or take dust baths, and the sight of them running to me when I shake the millet cups is priceless. But since they don't seem to be a good fit for our garden, we're planning to rehome them and possibly try again next season with different keets. I hate not being able to use the guinea compound after all that work and I'll definitely miss the birds, but at some point you just have to admit that it's not working.
I'll still be frequenting the forum so I can keep tabs on what others are trying, and maybe if we regroup we'll be armed with new and better methods.