Cross-project credit parity is impossible, for a number of
well documented reasons.
Adding together credits from different projects is like trying to sum toasters, miles per hour, and the color blue. The answer is meaningless.
Rather than adding credits from different project together for a total (meaningless), I choose to measure myself with MegaMilestones. That method makes the credits that a particular project awards meaningless. To compete in the MM game, means getting to a particular milestone (say 10k) in as many projects as possible. You want more of that MM than the next guy. Sure that means you will focus on the high paying projects at first, because those will be the quickest to complete. But after you achieve the MM in those, you will eventually have to move on to the lower paying projects too, in order to get more MMs. Just like your competition. So it doesn't matter if a particular project pays high or low. It will take each person at that project, the same amount of work to hit the MM.
Once you wrap your head around this, you quickly stop caring about the amount of credits that any particular project pays. It just doesn't matter any more.
Edit: Oh yeah, and the MM measuring method applies to teams as easily as individuals. Who is #1? It really depends on how you measure it.