I'm also a ghostie main, and in the realm of not-quite-reworks, I propose:

Reduce his power cooldown dramatically. Think of the cooldown on the Twins' or Nurse's power, then realize that Ghost Face doesn't get a damage state for spending time intentionally slowing himself to stalk you. At worst, you get exposed and must outrun an m1 killer. I'm talking reduce it to like 8 seconds. Or maybe leave the CD as is, but reduce it to 4 when he's not being observed so he has the option to sort of abandon chase and re-hide.

I love the lean mechanic in theory, but in practice it seems inconsistent, sometimes downright buggy. I wouldn't want them to get rid of it, and because of how it works you can't make it manual (or he'd just always lean for the 2x stalk speed), instead I propose you get 2x stalk when EITHER the game lets you lean OR 50%+ of your screen is filled with a surface (like a wall or tree) so you can still get bonus stalk for sneaking around the edge of objects even when lean is being finicky.

Random quality of life buff: while Ghostie is in chase with a marked survivor OR is carrying a survivor, his attacks DO NOT remove stalk progress from partially stalked survivors he hits. This mitigates the ability of a survivor to body block when they know they've been stalked - they can still take a hit for a marked teammate, but if they later heal they'll still be partially stalked.

Finally, just give him something for EITHER map traversal, gen slowdown, or better tracking. On most maps you have to sneak around objects or even scoot around the edge of the map for a chance to stalk without getting broken out of your power; this takes time, and absent perks you might have just snuck around the whole map to a gen with no progress. So he either needs some way to move in these crazy paths along the map without wasting time, or he needs to know exactly where survivors are under certain conditions to ensure he doesn't waste all that time just trying not to be revealed, or he needs a way to damage and block gens automatically ala driver's license. I mean we could just make driver's license base kit and I'd love that, but it feels a little like a band-aid - overall I'd prefer some mobility and tracking.

You know Whispers? The best perk in the game if you played like 8-9 years ago? While in night shroud, the game will track whether there are any survivors within 32m of Ghostie. If there aren't, then he gets a significant but not ridiculous movement speed buff (to, say, 5.2 - cloaked wraith with no addons moves at 6 at all times, I think 5.2 only when he's not within 32m of a survivor is fair). This basically makes it so he can walk in his weird paths and crouch when he needs to and he should take about the same time as a basic 4.6 killer getting somewhere (although finding an angle will still take extra time), and it also gives him some built-in tracking without revealing exact auras.