I would think the correct solution is a reorg of the regional structure, if there are huge discrepancies between the numbers of gymnasts. That would be easier and more "fair" than various other mechanisms for finding equity in the current imbalance.
The minimum score requirements are only marginally useful. One of the above suggestions, pulling in judges from various regions might mitigate this to some extent (there are four judges, pull each from a different region), but it still doesn't deal with the fact that it's not all that useful to compare scores that came from different judges. As much as there are standards for deductions, it's like the baseball strike zone - different for everyone.
The minimum score requirements are only marginally useful. One of the above suggestions, pulling in judges from various regions might mitigate this to some extent (there are four judges, pull each from a different region), but it still doesn't deal with the fact that it's not all that useful to compare scores that came from different judges. As much as there are standards for deductions, it's like the baseball strike zone - different for everyone.