@ozsouth
I can't believe you've updated the kernel again

I did not realise that updates were so readily available..... in my mind I thought these took time ie a few months in between to be updated.
Previous updates have given me back some RAM which I have appreciated and now I know the difference between the low-latency kernels.
Once again, I have to ask, if I am still using the 17 Dec 2022 fdrv (which is also provided in your post), there should be no difference with ALSA/PulseAudio usage?
BTW I did ask if your Jammy Development ISO was available to download? Which kernel would that be using? TBH I am looking for updated components eg GlibC etc to use for compiling.