I thought I had it all figured out but just went out to double check what I thought was a 20' x 40' pool is actually a 21'4' x 40' 3" pool. If I get a 20' x 40' Solar Cover how will it work on my pool? Will the wind pick up edges on the width as it could be 16" away from side, how significant evaporation loss with that gap. Larger size cover that I would cut down is significantly more money. Any opinions?