I think either I communicated my approach wrong or you misunderstood.
At 1st, 2nd, and 3rd level, a cure light wounds does 1d10 on a fighter and 1d6 on a wizard
At 4th, 5th, and 6th level, a cure light wounds does 2d10 on a fighter and 2d6 on a wizard
At 7th, 8th, 9th level, a cure light wounds...