Is there a best way? The current fee-for-service system perversely rewards ordering tests, no matter what the reason.
Capitated systems, such as paying a fixed fee per patient, goes too far the other way by encouraging test denials.
The best way is probably a salary with bonuses for both productivity and quality.
But no matter what the system, there’s bound to be significant resistance to it. The pie is fixed, and there will be losers to any reform. They will bitterly fight any change.