I was able to key the HR50 'clean' to about 27 WPM. This amp does
not have the QSK option installed.
Maybe I have an excuse to get a Mac now?

No idea how to operate one, the few I have tried seem very confusing and I used to have only Macs in the late 80s and into the 90s.
The CW note on the PB still has a warbly sounding nature to it. Rather distracting, frankly. It's a phase and amplitude modulated tone, by ear. I need to put the 'scope on it.
I keep doing the A-B testing to the Elecraft K2 to hear it. Tuned to the same signal, same antenna, same level, but warbly on the PB and worse at frequencies other than zero beat.
Also the PB has a **roar** of band noise, comparatively speaking. Seems like the AGC range is missing a bit or two, MSB.
I think the program would have be modified to drop QSK, or, it could be done in hardware with an external set of gates and an RC circuit.