How old are they? What is the percentage of protein in your feed?
If yours are still young, I believe mine are doing something similar to what you describe. My Cayugas are 5 weeks old, and their wings are constantly starting to droop, and being tucked back up in. They don't droop much before they pull back up, no more than an inch of sag, and they don't stick out away from the body at all.
When I first saw this happen, I had a panic moment and thought 'Angel wing
After quite a bit of research, though, I've determined it's (most likely) a developmental stage. The newly growing wing feathers are filling up with blood, so are heavy, while the just developing wings are still growing and strengthening the musculature.
If the problem worsens, or doesn't disappear by 8 weeks, then, all the 'experts' say, I need to consider binding it for Angel wing.
Hope this is relevant and helps in some way.