Hi and welcome here Richard!
Was also a great fan of Rise Of Flight for years and IL2 Sturmovik
Had the same pseudo on their forum too, if maybe you remember...
Best mod for SH5 is by far The Wolves Of Steel (TWOS) that you can download on this site, and for SH4 i would say Fall Of The Rising Sun Ultimate (FOTRSU) for US side of war in Pacific theater, or Dark Waters (DW) for German side of war In Atlantic/Baltic/Mediterranean/Indian/Pacific theater.
You’ll need to install JSGME to activate those mods, and for SH4 mods Large Aware Application (LAA) to allow more RAM for your computer (absolutely necessary)
THEBERBSTER made a compilation of all necessary explanations, easy to use and install even for novices
