In the case it did not weight well, based on experience with mine, I would pull all the suspension and start checking for squareness of everything associated at the chassis. I would correct that if needed and then build back checking as I go. It has to be in tolerancing stackup and should be corrected, but we are talking something really wild.
I would not discount - why do we disconnect the roll bars for weighting?
I am sure they don't all weight the same, but I would bet they all weight within some acceptable range. The components are jig manufactured.
If I purchased a new one and found such an error, I would be on the phone before the day was over and I would not be happy. After all, I purchased an ERA and waited a year(?) to get it.
chr