So many things can mess up a pot of sencha, but practice does make perfect, well, approaching perfect.
Yes time is huge, but temp of the water AND the Kyusu temp as well!!!
Also how much particle slips past the screen, thus continuing to brew in the cup. The right kyusu can be big.
This actually happened with my first trial of this year's Houryoku Shincha from Den's. Corrected this with the proper screen and lower temp too to start the TD, came out sooo much better, close to perfection! SweeTea would have to agree while Wulong and Shincha visited the TeaTable this morning.
