Sorry to see you go Steve. Know what you mean, though.
My old machine just barely ran SH3 and even then it couldn't handle GWX and I had pretty much given up on the game entirely about a year or so ago. Then we finally bought a new computer and now SH3 is brand new again! I can run GWX and a bunch of mods no problem, no graphics issues, no save issues, unbelievable difference!
I'll get SH4 someday, but with all the complaints I hear about SH5 I could play SH3 for years to come.
Good luck in the Pacific and give my regards to the IJN.