This late, i would not be taking leaves off up top. It's just ripening at moment, so it won't really impact yield to increase light penetration now vs potential dangers.
as far as lollipopping... again, a bit late for it to be most effective. if you make bubble hash or other extracts, the fluff can be used with great resuls, if not up to standards for use as nugs. If it's a barren stem at bottom, sure... the leaves completely shaded and mottled can be removed to imrpove airflow... as far as up top, i'd only do it selectively and minimally for airflow.
best time to defoliate and lollipop is about 7-14 days before it stops growing -- easier to know with a photoperiod, of course. do it once that way instead of multiple times. work smart, not hard.