Dru- you're absolutely correct on the steeping. and it also matters the type of tea. herbal not a caffeine problem
If you're ever in Nelson, go to the co-op and pick up some Mocha Mint tea, stuff rocks. First time I had it was ina arainy tent in Skaha and I put like 10x too much leaves per water in and I remember watching the roof of the tent and half my eyesight disappeared. Visual migrain, very cool . Also happened with Tazo Zen tea driving back form Squamish at 3 am. Couldn't see the other lane. not so cool.
Oh, and Mate Late rules!!! Yerba Mate too.