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Use the skull the bird come with, correct size all the time, its just that easy!
I make all my own bird bodies, they are the best!
I suggest degreasing it properly , solvent degreaser, put it back through the process.
Assuming the capes were handled correctly at the tannery, and you processed the capes when received in a timely manner, I would think the problem...
I use the same method for fur dressing, fur pieces, garment, wall hangers, and mounting whole mammals, the only thing different finishing.
They do not look fully hydrated, how long did you soak them in plain cold water? Also I looked on a bottle of dawn dish soap, I can not see any...
Hydrate flint dried skins fully as if you just removed them from the animal, then pickle fully takes a few days, remove the membrane, then...
Also agitate often speeds up hydration.
Hydrate 3 to 5 hours in cold water, no need to add salt, its just that easy!
Depends on how skilled or how much experience you have in dressing furs, if you do not send the skin out its just that easy.
If you do not have access to a drum or hardwood saw dust, you can achieve the desired finish by using cornmeal rubbing it deep into the fur, then...
Pickling of the skin does a couple things, changes the electric charge of the atoms there by setting them up to contract a bond with tanning...
Yes heat would speed up the fatty acids working on the skin, and no after this reaction it will not be reversible.
