Opinions on my first grow/Question

I have a 6 seed auto multipack from ethos (1 died) and the remaining 5 have been doing great somewhat, I only have a question about 1 of them (middle) not being a auto but a photo? My first time growing anything as well including dwc, I don't know what I might have on my hands here or if it's something I'm doing wrong as far as nutrients or environment, i gave 3 pf them a 16-16-22 ratio of general hydroponics following their medium feed around mid bloom in 3 gals of water and the other two at half strength of that same ratio, I try to maintain a good vpd for their current area, but the middle one (pina colada) just seems super bushy and i will defoliate few days here and there and boom back to being bushy. They by my definition are 8 and half weeks old, I also just am looking for opinions on how they look for their age, I also know that autos will flower on their own time varying from strain to strain so this might be it here as well, also do some strains look this small in buds at this week of its lifecycle? If I missed anything or need to provide further Info I can, thank you.