My 10 cents:

Righting a 18ft+ cat solo is tough. Face the facts that you may not be able to right a 20ft'er no matter what water buckets and levers you have.

The pole was designed for two people to use. Shroud extenders work wonders for gaining mechanical advantage. We have a set on our Getaway and you just can beat them. Water buckets can be advantagous, but are a lot of work.