Kirk,
I routinely run my 991a at 75-80 watts into a MFJ 994E turner for FT8. I might scale it back. I do believe I was using the 991a when I smoked the Z11 Pro II. A stray jolt from a lightning strike took out the CAT interface on my 718. CAT is the only thing that isn't working.
Edit - I did just turn it down to 50.
