I'm not sure what else you can do, doesn't sound like the antibiotic has helped much.
I'll tag in @coach723 and @Eggcessive hopefully they will have other suggestions.
I'm sorry he's not getting any better.
Do you have a photo of the Baytril you have?
Is it 10% Liquid?
How much does your rooster weigh?
Below is the dosing for 10% Baytril, that may help you determine dosing.
Do you have a photo of the bottom of his foot? I'd give his foot a daily soak in epsom salts to see if that will help...