It's been a while since I fired up FS... FS Genesis offers probably the best mesh out there for the price. I have that complete package too. I used to sim a lot using FS9 with the Wilco, Runway12, ActiveSky and PMDG addons, amongst others... but was it ever a struggle for my rig back then! How is it running FSX with the Quad?
Also, why are you limiting your FPS to 10?
Here are some of my s/s, when I was into heavy simming and editing...
LH 744 tail.
LH 744 in SYD.
T/O, LH 744 - shot a la Sam Chui.