Honey, if it's not broke, don't fix it! If he's finally STTN for you, I really wouldn't tweak anything at all.
I would call it karma for all those rough nights you used to have with him
Just watch out for warning signs like the naps getting shorter (1.5hrs is fine, but 1hr or less), and/or cot parties during the night. He may not be ready to go to one nap until the later range of *normal*.
He's almost 12mo old now right? Fwiw we had a couple of fantastic weeks around this age where DD was sleeping 2.5hrs for her one nap and 12hrs at night! That soon went down to 2hrs DT sleep and 11 ONS. Threw me at the time