Ah yes that tooth will explain the restless night.
I think for now keep with the long nap and the CN and see how his mood is and if the nights are okay (teething aside that is, it's not always clear if poor nights are due to teeth or routine). If he continues to do well on this routine I don't see anything wrong with it. Obviously if he ends up grumpy or UT/OT then it would be worth reassessing.
Just for reference, so far we've both noticed he does well on a longer than normal A time compared to the guidance times - so keep this in mind with future routines. Also if he continues to do well on the one long and one short nap this is usually what we see in 8-10 month babies (or even older) so keep that in mind too. It could be worth reading about the 2-1 nap drop ahead of time, it is usually around 10 months that people see signs of the 2-1 starting but yours could do this earlier than expected. it doesn't mean that you drop to one nap as soon as you see the signs, but it would mean a reassessment of routine and preparation for the nap drop. Some move to one nap early, say 11 months (like mine who showed the signs at 9 months) and some move to one nap incredibly early (say 9 months), so it's worth keeping in mind that some LO are just like this.
You've done so well in following your LOs needs, especially having faith in increasing the A for his needs and getting him such good sleep