[Elecraft] K2 Power Level

[Aaron K5ATG]

After posting the question I found this on page 102 of the manual:
RTTY/Data Operation
Since some RTTY/Data mode duty cycles approach 100%, you should reduce
power to about 5 watts or avoid transmitting at 10 watts for longer
than 1-2 minutes at a time. (Power levels above 10 watts are not
recommend.)

For me, 5 watts with FT8 is more than adequate.
Aaron K5ATG