Not the best terminology but I have in mind impedance matching as an analogy to this question. Throw a rock by hand or launch a projectile with a device. Start with very low mass projectiles through to so massive the device can not generate enough power to launch. There is a certain mass projectile that will give the greatest range so range versus mass will have a peak. The graph will be different for every launcher. Easy to test this with throwing stuff of different masses, same drag. What is the physics here?