Lighting is the biggest factor - more lumens = more growth.
200 true watts is not a lot for great results.
You are still giving veg nutrients, this has too much nitrogen for the flowering period and will encourage leaf growth at the expense of flower growth.
You are also still at the peak stage of flowering and bud density usually comes towards the end of the maturation process, so no need to get overly anxious just yet.
I would also suggest 18/6, cannabis needs adequate sleep to function properly and 4 hours of sleep is just not enough in my opinion.
Hope this offers some insights, Organoman.