You seem to want some reassurance and appear to understand how variable things can be, but it is my opinion based on my not so perfect first grow that 2 oz/plant is a reasonable expectation. My first grow was a 2 SSH grow (a relatively difficult plant to grow) in two AirPots under 3 MH 96 x 3 watt reflectors. It seemed pretty stretchy and was more than a meter in final height and is not known as being a high yielder. To make matters worse, I made my share of newbie mistakes. Along with everything else, the amount of light that your plants receive and what methods you use (i.e., LST, Topping, etc) will influence your yield. I ended up with about 4.8 oz from the two plants.
Assuming that your spectrum is fine, your yields and quality should increase with the amount of light that your plants receive...up to a point. I've seen different values presented, but if I remember correctly somewhere in the range of 600-1000 PPFD would be ideal. I'd suggest that you do some research on this if it interests you.