Winter cover size for 27' round pool

Jul 27, 2014
7
Warwick/NY
I have 27' round AG pool. Having hard time finding 27' covers, they seem to be either 24 or 28 feet. Should I get larger or smaller one? Also important part is that almost half of my pool is almost flush to the deck, very hard to get into there under rim. I saw a video on Youtube recommending using water tubes to keep part of cover on deck.
 
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