Here's my idea for a Pelagornis TLC

General Improvements (making it actually useful)

-Increase it's size and CW

-Increase it's base stamina to 200-220ish

-Increase it's speed to 1600-1700ish

-Increase it's base weight stat to 200ish

-Decrease it's saddle unlock level to 40

This is to make it more of an early game tradeoff with the Pteranodon between speed and weight-bearing capacity/stamina

Specialized Improvements (keeping it actually useful later on)

Option 1:

Focus on the polymer gathering aspect

-Increase it's organic polymer harvest rate

-Have it's inventory act as a "polymer fridge" which slows down the decomposition or stops it entirely

Option 2:

Focus on the "sea flyer" aspect

-Make it able to dive underwater and increase it's swim speed, but have a somewhat poor oxygen stat

-Give it an option to hold small creatures (up to the weight of icthyosaurus, thus the aforementioned size increase is necessary) in it's beak

-Sea creatures held in Pelagornis' beak that would usually die when taken out of the water will survive just fine

-It can pickup and hold creatures even while landing

-Instead of using it as a chair to fish with a rod, you can do the fishing minigame straight with the pelagornis by placing the bait in it's inventory, the fish will be drawn towards it's beak and once caught you can either use attack 1 to get the loot or attack 2 to hold the fish