You say that 2.4.3 is best sounding DAC Firmware thus far. Was this immediately apparent or was some "burn in" required. (Not sure how Firmware burns in.) Can you elaborate a bit on the improvements?
I likely will try it but want to have some idea of what to expect.
Firmware and software are instructions for a computer to execute a specific task so it doesn't require burn-in.
The most obvious improvement is coherancy of the sound. Everything just seems to flow and improved pace. A possible fix to jitter? Resolution also improved but doesn't sacrifice musicality.
There are multiple versions of PWD so dependiong on your unit, you will prefer a different version of firmware.
My brother has a PWD MKII upgraded from a MKI and he prefers an older firmware version. This is the reason I don't trust forums and just judge with my own ears.