@BuzzU
I just had a quick look at some of the game files and it appears the F-16 HUD symbology is slightly transparent whereas the F/A-18 and A-10 HUDs are not. To me it is a very minor difference but maybe that's the reason why it is easier for you. If you go to your mods/aircraft/F-16C/Cockpit/Scripts folder and open materials.lua you can change the color and transparency of the HUD and HMD yourself and see if it helps any.
The lines to edit would be line 24:
materials["HUD"] = {2, 255, 20, 200}
and line 56:
materials["HMD_SYMBOLOGY_MATERIAL"] = {2, 255, 20, 255}
The first number is the red value, the second number is the green value, the third number is the blue value, and the last number is the transparency value. I believe 0 is the minimum value for each and 255 is the maximum value for each.