Try maxing out the first two, and on the graphics page, if it's not already, set the Global texture resolution to max also and see if that does it.

Now bear in mind this will probably have an effect on performance, and is for resolving the texture issue only, if you have a smooth flying sim now, and jerky afterwards, but the grid problem is gone, you will have to decide which is more important to you. Performance or eye candy.
Generally, eye candy for screen shots, performance for flying. When I still flew in FSX I had my settings low to enjoy flying, but would then crank them up for a couple of quick screen shots. Not everyone agrees with this method, but it worked for me, and may work for you also. No two conputers are alike, and these settings may not even affect your performance, likewise it may also turn it into a stuttering snail. Let me know how it goes.