As long as the great majority of the surface is covered you will be fine. Having a good fit around the edges helps in windy areas, but isn't essential.
When trying to get the FAS-DPD test make sure it's actually FAS-DPD and not just DPD. You probably already knew this, I just wanted to reinforce it because a lot of Leslies don't carry the FAS-DPD in stock.
We love our solar cover. It's a 12 mil clear and has definitely warmed the pool a good bit. I can tell a big difference when I get lazy and leave it off for a night.
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