I wouldn't worry too much, are you happy with the way he's sleeping? I kind of tended to go with the flow with my bubs. DD is 12 months old and has her first nap at around 9:30-10am and has her second nap around 1:30-2pm. I've had to enforce these times to work around picking my DS1 up from school.

Sometimes reading suggested routines can do your head in! If you and your bub are happy with the way things are, then I would leave it. 7:30pm is a very reasonable time to go to bed at night and it sounds like it's all fitting in nicely .