I have this issue with an old lady with an (under control) thyroid problem.
Once she starts prancing around for food, big teenage boy cat chases her so I'm woken to hissing and growling. Nothing has worked to stop it. Her internal food clock is strong and she seems to metabolise food much quicker than the boy. Giving her a bigger dinner wouldn't work.
She gets fed more than him, has food as we go to sleep so say 1/2am. They have dried food at all times. We can't lock them in due to house layout. Shouting doesn't work. Telling either off doesn't work. Closing the door would just lead to persistent scratching and howling/yowling. Ignoring doesn't work as it goes on and on. It doesn't stop. We can't keep them separate - layout.
We would not use spray bottles, I feel that's cruel.
Don't know an auto feeder would feed 2 cats wet food, one with meds added, and one who likes his food to be in separate dishes and can be very flighty. Plus the boy leaves food as he's a grazer, so it's kept covered/fresh and we try him again a few times and he usually will eat more. At lunch time, old lady gets his leftovers.
If the food was left down, the old lady would shoulder him out of the way and devour his. She used to do this but now finishes her food and sits and patiently waits for his leftovers (which she doesnt get as we lift it). Wee shites but they're absolutely adored. My husband is able to sleep through the noise.
I wish you luck, I'm sure you can find a solution which works for you 🤞. Will be reading with interest. Sorry totally didn't mean to go on a rant. Hoped my thoughts might throw something up idea wise!