no matter the bot you use you will need a delay. I know everybody wants to do it all at once. but you need to understand that you have to mimic the human behavior as much as possible, even if it works now and you get away with it, it might change in 1-2 months and all your accounts are toast. take it easy and make it look as normal as possible. what human would do unfollow at 0-5 sec delay all day long?