People are making very valid points about Waitangi claimants with slight maori bloodlines but providing no formula on how to address this anomaly. Well here's a way, it's called the Ethnicity Equalisation Scheme (EES).
For openers, let's look at the quixotic definition of maori in S.2 Maori Affairs Act 1974 which most sensible people consider to be ludicrous. If claimants are going to use any level of Maori heritage for Waitangi claims then a scheme is required to have authenticated documents to ensure whakapapas, Birth Certificates, Driver's Licences and Passports, etc. all showing the degree of ethnicity attributed to claimants and this must be the minimum legal requirement prior to obtaining any handouts from Waitangi claims.
It follows when looking at a tribe/iwi of say 2,000 ‘members' it needs supporting documentation and evidence for every iwi member (available for public inspection) and then the ethnicity of the whole tribe must be averaged out.
If perceived grievance claims are for some reason successful and assessed at say $32 million, then if the average maori ethnicity of the tribe is 1/8th then the payment out would be $4 million and $28 million would be withheld along the lines of the ‘contributory negligence doctrine' to the extent of 7/8th representing the ethnicity percentage other than maori and funds returned to the NZ taxpayer via the Government.

R Paterson, Matapihi.