I am liking the new larger dimensions you have. Next up on the chopping block for you hardward wise is going to be some sort of better lightsource like a 150+ watt dual spectrum CFL or an LED. If you have the air exchange for it, a 150 HPS. Another route you could go with far less upgrade cost would be to grow taking advantage of the large height you have there and grow using lights on the sides of the plants. With a little work and maybe an additional power strip here or there you could still pull a pretty decent yield off that plant in theory. Yeah, the more that I type here the more I think you need to move your lights to be vertical in your case so that each budsite is getting decent light. otherwise, it will just be the canopy on that thing that has any yield of worth for you. A good example of what i mean can be found in Herbal.Experiences current PC grow with his vertical power strip configuration. Give that a look if you have not already.
I am subbed up and watching for sure.