Taking Cara babies /eat play sleep

Ok, I’m trying to follow this schedule and I’ve taken the taking Cara babies class but I’m confused on one thing!! If I’m trying to feed baby every 2.5-3 hours but his nap is only 30 mins… then I try to keep him awake 60-90 minutes I end up feeding him close to his nap and if that nap is short too then I’m even further off my times for the next wake window! Not sure that makes total sense but I’m trying to figure out if I just feed him when he wakes no matter what? I just know he doesn’t eat as well if it’s that short of a time. It’s almost impossible to keep him up especially if nursing gets pushed that close to sleeping time. I do make sure he’s awake after nursing and before I lay him down but it’s usually like 5 minutes depending on what the time frame gets pushed back to. Any advice? Thank you!