I believe, if you got FSX for the scenery, you got the wrong Sim. I understand P3D is great for that, as is X Plane. FSX is to simulate flyinh airplanes. At lest that's how I understand it. It's not perfect at that, either, but it's pretty good, from what i can tell. No, I was never a professional pilot, just gliders and some light GA's, but flying those on FSX has been pretty close to what I recall. As for the heavy iron, No clue, but I am thoroughly enjoying the latest FSXBA FA-18C Hornet.
I use a Dell 1750, made for gaming, only 2.4 GHz, 4G RAM, Radeon 3600 GFX card, getting a bit long in the tooth (do computers even have teeth??), and would you believe it, it runs FSX-SE pretty well. Been running FS9 since I upgraded to this PC ($5,000 at the time!), and that really goes for a treat. I found the trick with FSX-SE is not to demand max 3D clouds out to infinity, and ultra-high scenery settings out of it. To me, an accurate horizon and smooth operation are plenty. Oh, I do like to see the runway and lights of it clearly, not to mention the cockpit switches and gauges, of course. After all that, anything else is gravy, and this machine actually does pretty well on that too.
Hardly an FSX.CFG tweak to be found, either. Just the runway lights settings you have to add in, everything else, Steam set for me. I'm sure I could get in and twiddle every setting in the CFG file and really mess things up, but why?
If it aint broke, don't fix it, and one of Murphy's laws: if you mess with something long enough, you WILL break it Both rules for me to live by with FSX. Add-ons, sure, but not a lot of scenery. It's not why I got the Sim. I got it to fly planes, and THAT it does fine for me!
Pat☺