You can find pictures of these tea bags here, by searching for "Yamamoto of Orient" in the Brand field:
The green one second from the right is ubiquitous in budget hotels throughout Japan. The one on the very right is put out by Stash. Regarding the boiling water issue, I called Stash just moments ago and asked them about their brewing recommendations. The kind lady said to let boiling water sit for a bit so it drops to the 180-190 F range, and then steep for 2-3 minutes. This jibes with my experience that boiling water makes a drink that's strong, sour, and yellow.
How much are you paying for those Yamamoto of Orient bags? Cause if it's anything close to the $3/box Stash charges for theirs, you're getting reamed. Loose kona-cha is worlds cheaper and better tasting.
--crymad