Tl:Dr, High food cost alongside low manipulation makes several morphs nearly unusable, which is a shame with some of their cool abilities.

Did you make them paragon? Paragon limbs fully negate the penalties while still keeping (or bettering) the benefits. Just tested all limbs with the debug part picker, all arms and hands get full manipulation back at paragon, all legs and feet get full manipulation back at adapted (no paragon). The only exception is the foot-fins which makes since.
Seeing as how the wing mutations are replacing the arms and hands with a wing membrane and a bone structure to support said membrane it makes total since that there would be little manipulation. Most birds use their head, neck, and feet for manipulation, not their wings.

So until you have paragon serums researched and made I would hold off on winged monster morphs. If you haven't looked at the monster pics yet there is a link on the main page for the list of monsters. You could use that to help avoid getting winged morphs until you have paragon stuff. (Or you could use the debug part picker to make them paragon after the fact.)

Hope this is helpful for you.
One suggestion for the mod author if they read this would be to have paragon jaw variants since most Pawnmorph morphs do.

This is a huge help and makes a lot more sense for how strong some of the morphs are, thanks! Did not have paragon serums online at all lol, will beeline those now.

No prob, happy to help.

You can also buy the serums sometimes (I think) from morph/exotic traders and faction bases.

I've never seen them being sold before, only ever obtained are quest or dungeon loot sadly

Might be one of my modded trader groups then.

All the wing arms have paragon versions that negate most or all of the drawbacks of wyvern wings. As for the jaw parts I'll think about it. Right now none of them have stages defined because i was exceptionally lazy. The ones that are meant to be social (eg. mizutsune) iirc have very low or no impact on speaking.