You wrote
The ideal seems to lead one logically to solve the numerous problems now and for future 1000 mile races to a Formula 20 class that allows all types of 20 ft 8,5 beam cat designs and their teams that sail them to race equally .
Just as the Formula 18s the same basics of length beam weight and sail area boats in class.

Well the devil is in the details. The F18 rule was carefully thought out and for the most part, boats were specially designed to be optimzed under the F18 rule. All of the existing 18 footers were made obsolete by the rapid acceptance of the rule.

The pragmatic solution is simply to take the US spec'ed I20 and declare that this is the formulae. However, in practical terms this means that sailors on other platforms would not be able to measure in AND compete on a level playing field. For instance, the N6.0 would have to down size its chute to measure in or use the I20 rig on a 6.0 platform.

What race is the most important to the sailors.
Elapsed time.
One design finish.
Handicap finish.

It probably depends on the sailor and their goals...You won't have one winner in the current format.

Take Care
Mark