You want the water to reach no more than 190F, above that and you are losing some of the more delicate flavors. This is one of the reasons that a hot pot with a thermostat is often used for cuppings.
I'm feeling bearish, and I'm packing a Wusthof Grand Brisket slicer from MABA
Whip It Off, Chambers!
"perhaps...but then again...maybe not..."