Guidance times and routines simply are that - guidance. You will know now that on BW we don't expect all LOs to follow the same schedule but rather a routine which is suitable to their sleep needs, nature and family circumstances (such as school runs).
In terms of guidance then, an 11 month old would be on 2 naps.
In terms of your own individual routine, if it's working I'd leave it.
he's been on one nap for months.
I see from your previous thread he was still taking 2 naps 1 month ago and going through a possible transitional period to 1 nap. This transitional period can take a while. As you've now found a routine that is working for you I would say just stick with it. Yes the A times look uneven but lots of routines have uneven times.