However, the sleep cry that usually happens between 4-5:30 AM is usually more intense and lasts a couple more minutes but luckily he's been able to go back to sleep. I'm not sure why he always acts up around that time period. His room is pitch dark, white noise machine, comfortable temperature..just not sure why!
I think that can be really normal for some kids. It's a typical time to change back into a lighter stage of sleep. If it changes to where he's staying awake for longer or not going back to sleep, then you probably need to reasses routine.
Teething hasn't really been an issue with him. I never knew new teeth came out until I would see him laugh and then all of a sudden he has new teeth! He's never been fussy or changed behavior due to teeth.
Wow, consider yourself lucky!!!
What should be his total wake time for the day (not including the nap)? 11 hours? Should the last wake time be a certain amount of time?
These things can really vary for each LO. At his age, with a nap of 1hr, I'd say total A time for the day could be anywhere from 11-12hr and be considered normal... low sleep needs, probably, but definitely normal. The last wake time is also dependent on the LO. Some like a longer morning at this age, and then a shorter afternoon. Some like the opposite. I'd say with a push to your morning and the wake-up getting better, you're on the right track.
I'm a little worried about his total sleep decreasing...
I can understand that, but it's not a definite thing. With tweaking, his morning wake-up has come later and he may get back to more sleep eventually. If not, and you're not seeing signs of struggling with OT, than it might just be all he needs.