Dude, I read your journal, & looking really good! You obviously have a greenthumb. OHM makes some good points. Some people call the lower buds "sucker buds" cause they suck the plants energy away from the main cola. So you might want to pick them. He (Ohm) also mentions trimming some of the lower leaves, while that will improve airflow, and reduce the chance of mold. My concern is also about light penetration, and I don't think you have a problem with airflow.
So far as trimming leaves, that's a debate that will never end. Since you asked my opinion, here it is, I would trim some leaves, I found that the light was not penetrating as far down as I wanted, so I trimmed some (a few) of the upper leaves at 20 days from harvest, and again at 10 days from harvest.
Please remember it is much easier to not trim enough leaves, and come back tomorrow and trim some more leaves off, than it is to try to crazy-glue those suckers back into place, cause you've cut too many off.
Point is, don't go crazy. At 20 days from harvest, you arent going to hurt anything, and the increased (light) penetration may help.
Peace
If your not comfortable trimming.....don't do it than.