My estimation of 2-3 ounces per plant may be way off but you have to remember that the system I am growing in is all about speed and yield. The only reason my girls aren't a foot and a half tall by now is because I burnt the fuck out of them and them the slime came and blew loads all over my roots. Those two things stunted their growth so I am actually way behind where I should be. It's ok because I didn't expect them to make it this long and I will recover any lost time when I add CO2 next weekend.
You are growing in soil and that is not going to give you super crazy speeds or yields but should provide a beautiful taste if you do it right. Remember, it's not appropriate to compare two very dissimilar systems and expect similar yields. Yeah you can pull an ounce off each of your plants, IF you don't fuck it up! JK, but for real don't be so concentrated on per plant yield until you are a more advanced grower. I am really unconcerned with my per plant yield, I was just guessing cuz you asked.
Again, I am happy my girls are still alive. Every time I open the tent and see them alive it makes my balls glow green, is that normal?!?