Something to keep in mind is that all of the tables are only trying to measure one thing and lay out the effect of the one variable. But in reality these can be mixed and matched for the desired performance characteristics. 10x is indeed possible by doing multiple things to extend the life of the cell.

Pull 4x from one table and 2-3x from another and it would probably put you somewhere in the 10x range. Though I'm not sure it would be strictly multiplicative.