If the Radeon was being used, 320 - you would see this

[DISPLAY.Device.Radeon (TM) HD 7670M.0.0] <<<<<<<<<<<<<<<< the second "0" indicates "This is the DX10 port"
Mode=1366x768x32
AntiAlias=1 <<<<<<<<<<<<<<<<<<<<<<<<< This gives you AA, and you should have this ticked inside FSX
Anisotropic=1 <<<<<<<<<<<<<<<<<<<<<<<< This gives you Anisotropic Filtering


Instead, we see this:-

[DISPLAY.Device.Radeon (TM) HD 7670M.0]
Mode=1366x768x32
TriLinear=1


Further down - we find the Intel GPU - with the correct settings for both DX9 and DX10:-

[DISPLAY.Device.Intel(R) HD Graphics Family.0] <<<<<<<<<<<<<<<<<< DX9
Mode=1366x768x16

[DISPLAY.Device.Intel(R) HD Graphics Family.0.0] <<<<<<<<<<<<<<<<<<<DX10
Mode=1366x768x32
AntiAlias=1 <<<<<<<<<<<<<<<<<<<<<<< Correct
Anisotropic=1 <<<<<<<<<<<<<<<<<<<<<<< Correct

You need to disable the Intel GPU (or force FSX to use it, but the Radeon is the best bet..) Find out how it is done: I will do some digging too.

All the Best,

pj