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Trevor,
Set your ISO to 100 or less, 800 is way too much for lightning. The best lightning photographers tend to go for 50 or lower as this allows you to take longer exposures without the grains aswell as giving a sharper overall image. The 800iso value you have may be the cause for the overexposure. 5.6 apature is a good place to start, its a fairly round number and for a majority of storms maybe all you need, but experimentation is the key. Dont be afraid to zoom in a little too, sure you may lose a few strikes but filling the screen with a bolt is by far better than having a little one in the corner.
Just a few more tips..
Good luck.
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