I would advise against any defoliation, especially during flowering. Your plant needs each and every leaf she has to make the energy she needs to grow her biggest and best flowers. Lollipopping the small inner/lower growths is a better way to go about the problem of small crappy buds.
Just remember -
Maximum amount of healthy green leaves = maximum energy produced = maximum growth and maximum health.
Besides, if your plant did not need the leaves, she would not grow them in the first place!
Your plant also needs the older fan leaves as a source of pre-made nutrition that she will draw upon during flowering, as it is far more efficient to do so, rather than grow flowers AND make the stored elements (carbs, sugars, amino acids etc) in her older leaves from new, at the same time as trying to grow flowers. So, not only does defoliation reduce your plants capacity to produce energy, it also robs her of a vital source of pre-made nutrition she needs to grow her biggest and best flowers. This recycling of the elements from her older leaves is also why the leaves go yellow (the fade) during flowering on otherwise healthy and well fed plants during flowering.
Hope this helps,............
Organoman.