Interesting, Chip.
So I have 
this gyokuro and 
this shiboridashi.
I've been using 140*F water, and 1.2g of leaf per 1 fl oz of water. You probably already know 
O-Cha's brewing parameters, which are what I've been using.
Should I go for a lower temperature? Less leaf? More?
As for water... I think I might start a new topic on that, because I have a... thing... about bottled watered... I'm not a fan, because, to me, the whole idea of bottling 
water is patently absurd (it's on par with the bottling of air to me... that level of absurdity). I won't get into why because it's a whole political rant that isn't really on-topic for the forum... 
 
  
 
I live in New York, but not the city; I live on Long Island, in Huntington Station. But we do have filtered water via our fridge which has a really good filtration system (supposedly). So I guess what I'm saying is that my ethical/political ideology prevents me from spending my money on bottled water. Which, of course, limits the water I have access to...
So...
Um... 
Yeah...