Subcontractor Past Performance: How Do You Get Credit for Prime-Level Work?

The eternal sub dilemma: you did the work, the prime got the CPARS. Strategies: negotiate past-performance references in your subcontract; document everything (awards, metrics, customer quotes); use the work in your own past-performance narratives with the prime's permission; build direct customer relationships where the contract allows. How do you make sub work count when you bid as a prime?