Why don't you buy a small fishing scale to put in your case, that way you can weigh your cases and adjust them all to the maximum allowance for your flight. We bought one that goes up to 50kg for only £3.50 which is a lot less than you get charged for being over weight.
If 5 of you were travelling with Virgin in economy that would mean you could have 10 cases (23kg each) and 5 flight bags (5kg each)
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