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Drilling new holes in patio? I didn’t get a straight answer about why not pulling it tight other than it’s as tight as it goesNo, that’s not normally how they should sit after the snow melts off it, the springs should be pulling it taut. Your photos seem to show that they installed the anchors too close and that’s limiting just how tight it can be. A small dip is ok but not that big, it looks very very loose to my eyes. Those covers are made with doubled up polyester straps that don’t stretch. A simple fix would be achieved by installing new anchors.
No water on cover from underneath. It started low but unclear how it compares them to nowDepending on where your patches are and how well they're holding up, you may have pumped pool water through the cover, making the sag worse. I doubt it started that low.