The A times don't necessarily need to be equal throughout the day, some like a short first A time like scsparks has found success with, some like a long first A, like my DS. His first A times of the day needed to be substantially longer than recommended for his age, BUT a lot shorter for the rest of the day.
Lots of other things also impact on the A time and naps, stimulation being one to look for. OS or US can impact on how tired LO is. My DS's long first A was always at home with his own toys in his own environment and rarely with any visitors. He played lots but could cope with a long A with this level of stimulation. However, the afternoons we went out 5 or 6 days per week to play groups and other activities, these were always substantially shorter A times because he was super stimulated from the groups, the toys, environment, the other kids and parents etc.
I advise keeping a written record over several days or a week with all the times and a rough note of what level of stimulation there was plus how easy/difficult putting to sleep was and LO's mood on wake up (happy and rested or crying with tiredness). You might feel like things are all over the place right now but after recording it all you may be surprised what you discover and that would be a good place to start working out the best routine for your LO. When you begin to experiment with timings this written record will help you keep track. You don't have to do it for ever but it really helps during a period of change.