Last season, I trimmed mine with a couple extra inches so it can fold upward to keep debris from falling into the pool. but I find myself fighting to flatten the cover to the water and looks bubbly.
I just laid out my new cover and is about to trim it down. I have a kidney shape pool. Was debating on if I should trim it down to the waterline or leave the folds again. Just wondering what the seasoned solar cover user are doing and what works well.