hi , we have just purchased our first spa , a lazy spa vegas. its a great piece of kit for the really low price (£280...about $2.50!) but it holds rainwater in the inflatable cover and I'm worried about it putting too much strain on the tie-down straps. I have several ideas how to overcome this but wondered what would be best. 1. overfill spa , so centre of cover sits higher than sides of spa. 2. float ball/float ring in centre to lift cover so water runs off. 3.combination of both. 4. move somewhere drier. 5.any other options?? please be gentle .... first post!!