The biggest variable in tea, taste buds. Consistency or accuracy cant
compensate for your biorythms. I've always called the phenomena the
'idiosyncratic personality quotient'. Tea is basically a biofeedback
mechanism. The monks have known this for centuries. Each cup of tea
reminds you The Now is not the mystical Then. This will come to you
sooner or later.

Jim

PS The other day someone gave me some spinach from their garden. I
rolled some into a bundle and started gnawing from the end. It
immediately struck me what tea is missing the most is chewing. I do
drink my leaf off the top and enjoy a spitwad now and then. Since I
know I cant absolutely control tea taste I dont worry about it anymore
perse (my methods have changed over the decades and still do) except
when it comes to wheres the taste homeopathic gongfu :-).