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P.S....I do have that ORB X Pacific North West (Bowerman) Scenery demo installed. I'll give it a try, but my Hardware doesn't handle my FSX very well, with my preferred (very high!) settings, which is the reason why I use FS 9! (With all its settings at Max!)....

...!
And of course you are well aware that the maxed-out settings of FS9 are equivalent to middle-to-low settings in FSX, right ?

Given your love to low and slow, I believe the Bowerman scenery (and mountains to the north) desserve a flight or two, with carefully set graphical options.
I constantly do scenery comparisons using my FS 2004 and FSX.
My FS 2004 with my various Payware and Freeware Scenery add-ons, with all my settings maxed, runs
smoothly locked at 25 FPS, and running at 24.8 FPS.
My FSX with similar settings, over the same scenery, judders along at a crippling 2-5 FPS. Its NOT a very enjoyable experience!
Note: My add-ons are simply
added to my default fS 2004.
My FSX SP1-SP2 has never spent countless days, weeks, months, years of tinkering with Nick N's, Jesus', etc, cfg modifications...
...life is far too short!...
..I just want to pop into the cockpit...and fly...(or pretend to)...

...!
Paul....FS 2004 + FSX...choices...

...!
Dell Tower.
Pentium 4, Dual Core, 2.8 GHz.
nVidia GF 9500GT 1 GB. PCIe.
320 Watt PSU.
2X Sata HDD's.
Fine for FS 2004...Naff for FSX!
Win 8.1 64-bit. DX11. Advent Tower. Intel i7-3770 3.9 GHz 8-core. 8 GB System RAM. AMD Radeon HD 7700 1GB RAM. DVD ROM. 2 Terra Byte SATA Hard Drive. Philips 17" LCD Monitor. Saitek Cyborg X Fly-5 Joystick. ...and a Briggs and Stratton Petrol Lawn Mower.