dont worry, you didn't write too much.

But anyways, your grow looks good going along very smoothly! If you are concerned at all about your plant size then I would say choosing to flower at 6 nodes is not bad at all. You could have actually grown more than 1 plant with that kind of lighting (maybe 3) and got some more bud but for now 1 plant is good.

You are right in that the plant is sloughing off its old dead leaves in order to help production in other areas. Your buds are taking this energy from the fan leaves that cannot be sustained. A good rule of thumb that I go by is to let the leaves die on their own, but if they look like there is no point of return then you can use a clean razor blade to cut them off. Sometimes if they are really yellow they will just come off with hardly any touch. It is a good idea to trim the fan leaves towards harvest more and more so that the buds can get more of the nutrients.

Marijuana puts on most of its weight during flowering in the last two weeks so try not to get inpatient. I am trying to do the same as we speak!