They def. had a good back and forth, but to me the only overtly romantic moment before the end was when Asami complimented Korra's hair and she blushed. I dunno when the writers decided to make them an item, but I would've included more flirtiness between them to make up for the lack of makin' out on screen.
Then you have to meditate more or just let Tumblr folks guide you
http://lokgifsandmusings.tumblr.com/post/106015641518/analyses-round-up-post
The writers can't go all out with the homo since this is basically a kid's show (gawd 21st century)
Personally, rewatching it with Korrasami endgame in mind, it's easier to see the subtle hints of organic love growth otherwise called natural progression, in contrast to the shove in our throats Makorra het romance if you could call it that.
Meaning, I'm still shackled by society's het norms, urgh, coz I totally didn't let myself believe that it's really yuri.
I've been reading those analyses, browsing gifs, and it feels great since it helps me enjoy more, celebrate and embrace this historical canonization event