Are the 250a breakers even needed? Seems like you could go from the main and tap right to the panels....
Am I correct here?
This is a SquareD I-Line panels and I don't have any provisions to tap off the bus.
The reason this whole issue exists is because the contractor who installed this applied 4/0 at it's 90c rating as opposed to the 75c rating.
So basically, if the 250A breaker is incorrect either 225A breakers need to be installed or taps could be used like you mentioned. The other option is to replace the cable with 250mcm which is an expensive option.
This problem applies to about 100 different installations so I only hope it is somehow legal. I don't want to call out the contractor but they have been in the news lately for the work they have done for the military.
This is not a safety issue because the service lateral and feeders are oversized for the load. I am not worried about an overload condition.