Hi @SPSpain I just saw your PM about the 6th question. This is not one I can address directly as I have always used the newest version of Preform and Firmware. I too have seen a few other posts about issues with certain types and versions of resin. In those cases downgrading to an earlier version of Preform/Firmware seemed to yield better results.
One thing I know for sure is 99% of the time, @Frew and the other FL employees will recommend using the latest versions and then try to work out any issues from there. I hope that answers your question.