I'm not really familiar with the ATI-settings, but maybe you could tune down your anti-aliasing? The picture may look more crispy, but that will also increase the chance that you will see dots, that get simply blured away with higher settings.
I use similar settings on my PC, just with the 8800GTS and I am not getting as good results as you do, as I just noticed....
Well, anyway: The higher the AA-value, the more samples are rendered and calculated to smooth out single points. If you see the plane as a dot, that means that 16 samples shade the black dot minimally down to the surrounding color. What is great for the general looks, can be really bad if you WANT to see those single dots.
On another note, you should try to disable the S3TC-Compression in your IL2-INI. I am pretty sure you graphics-card can handle uncompressed textures and it will increase the overall looks with little loss in FPS. (On the other hand, if you don't have "Texture Compression ABR Extension" enabled, I don't know it S3TC will work anyway)