Sounds like the rough nights right now may be due more to teething than to the feeds, if he was actually going toward one feed and now has reversed.
. Generally though, if you don't see a pattern between days and nights, there's probably a prop at play.
I don't think you have to go CT if you don't want too, even if he technically doesn't need it. He can still be a better night sleeper with one feed. I think you just need to pick a time to feed, whether earlier in the night, say 11pm or midnight, or not til early morning (e.g. not before 4am) and then resettle all other wakes without a feed.
I kept one NF with my DS until 16mo (I did the 'not before 4am' option),
because it ensured he didn't EW and I enjoyed the one-on-one cuddle. He slept through the rest of the night just fine, although I did have to do some PD around 12mo to wean the other 1-2 NFs he was having.