I'm going to begin testing today on naked AC outlets. That's right - no wall plate at all. If stripping away the cartridge body was such a meaningful improvement and speakers without cabinets perform so well, this has to be a move in the right direction. I anticipate a certain amount of challenge on the WAF front and I must caution those of you with small children and animals to be circumspect about imitating this daring experiment.
I'm hoping that removing the plate and giving the electrons more elbow room will lend increased air to the presentation. Think about how constricting a wall plate must be to your AC supply regardless of its origin or pedigree.
If anyone else is bold enough to attempt this, please post your results. I'm strongly considering marketing this tweek.