Man that sucks that your rainy season lasts so long, on a plus side if you don't see and pistils yet I'd keep hitting them with alot of N to try and shoot them up. I've been in the same situation before with 30 of them outside... I learned I cant go straight in the ground so early or the constant flooding made them runt, but I did have ones like yours that seemed to stay small at first but didn't show signs of flowering like the rest and they exploded, they actually did really well, so hopefully they take off, plus I keep feeding mine veg until theres visable popcorn buds, I find it helps them stretch even more. I hope that makes sense I'm stoned lol