I am no expert by any means but you are going to get your 2oz per plant no problem! As long as you flower them to their due date you will do fine! Just don't chop them too early and I would say around 3 per plant. But like you said aim low and be supprised and you will be happy! If you are happy with two then shoot/expect for that much. The cool thing about LST is that all your budds are colas! So you will get some fat ass tops! Don't know if you are looking to make money or not but two per plant is allot of meds! I have my bubbalicious LST's that I am supper happy with! I am thinking that LST is the only way to go now, I just want to compair my harvest to my last NL grow and see what plants I get more weed out of.
All and all your grow is looking great and I hope you get 5 oz's per plant!