Yeah, I might be more aggressive on the first brew than other sencha brewers.
I find if I let the cup sit and let some of the sediment filter through and steep in the cup the second brew is almost as rich as the first.
For the third I brew higher 165-180 depending on the tea, and while the "creaminess" isn't there it is still flavorful in a different way. Subsequent steeps I drink more for hydration/health benefits than the taste, although some of the better senchas are still tasty into the fourth brew.
My goal is to have consistent flavor strength throughout the first 3 brews, although the flavors and colors are different with each one. Not always the case though
. Usually with a few attempts I'm able to "figure a tea out" and get pretty predictable results.