Alot of the THC is stored actually, in the stems. the entire point of harvest is to harvest with the stems attached.. over a few days the THC is absorbed into the buds as the water content lowers.

Always good to keep the buds on the branches after you harvest for at least 2-3 days.

as for continued flowering? it's more than possible.. infact, i've done it. all i've done is simply cut back the main harvest.. leaving the small under developed flowers and buds.. for an additional 3-4 weeks