Drinking a session of the LIshan daily, I am enjoying it more since that first day when I had opened the pack (using similar preparation). Although I close the pack very tightly a with a strong, broad clip, I think a bit of air helped the leaves deliver flavor.
I have been enjoying all sessions more than a few months ago. The Lishan's flavors are stronger now, more forward, w/o being harsh. I had called the LIshan simple & gentle which now are the words that would come to mind. I believe the Lishan needed time for its flavors to develop fully.
A few weeks ago a pack of Shanlinxi seemed to me to be significantly more flavorful. I had assumed that somehow the tea seemed that way because of something happening in my body, not in the leaves. Now I think it also opened up w/ time.
Now I am thinking that with a few months of resting, flavors have opened up & wondering whether I knew this before & in my old age forgotten it


That gaoshan might do this probably does not surprise many members here; however, I may have dismissed my own feeling that this was happening. Moreover, I have not respected the concept of getting a tea that produces little likeable flavor presently expecting flavors to open up later. (I still would not buy a tea that I would not enjoy much w/ immediate preparation.)
Anyway, tea is complex. Tea in vacuum packs can change from being very good to being its best & then start moving down in quality. Sort of puts us under pressure if we obsess about absolute enjoyment of our inventory. Cheers