UPDATE – tried this today with almost double the quantity of leaf I normally use and lower water temperature. Got 4 great infusions out of it with no astringency. The first infusion straight up tasted like gyokuro, full of rich umami flavor. I steeped it at 155 F for 45s. The second steeping was a quick one, 30s at about 165 F. Much fuller, matcha like strong vegetal flavor. There is the slightest hint of bitterness as it goes down, but not unpleasantly so. The third steeping, 45s @ same temperature, was like regular sencha. Grassy and sweet. The tea went flat on the 4th steeping. It had a light, brothy character. Still good, but not as memorable as the earlier infusions.
Upping my rating as this tea continues to impress me and is a regular in my green tea rotation.
Flavors: Grass, Seaweed, Umami