While the control changes for the crow are nice, the initial speed boost especially, I still think the momentum isn't being handled correctly; The map is filled with high pillars and ledges that make for some very scenic views (draw distance not withstanding) and soaring over everything would be a nice extra reward for completing a tricky parkour section but after a few seconds in the air you just stop moving forward and slowly glide down like a minecraft chicken and it just feels wrong? Like that's not how birds are supposed to work?
Now, I am neither bird expert nor game designer but from what I understand about birds the wings make them glide but it's the flappage of the wings that makes them go up, so maybe repurpose the jump key when in crow form and have the player manually flap the wings, like, have it so that when the key is pressed the wings are out stretched and when it's not they're closer to the body; I think it might work but then again my brain is only half-working at the best of times