When I farm him, I usually just kill him, save/quit, enter, and do it again. Wilhelm is probably the least efficient at killing him, but you can definitely cut your time in half as you’re gearing up and figuring out where you’re losing time. My only 70 is Jack, and I’m no expert on Wilhelm, but the basic process of cutting time is figuring out how weapons are balanced, and figuring out which skills your class has which allow you to mitigate drawbacks. For example, rocket launchers are balanced by having low magazine size, low ammo pool, (typically) slow projectiles, and horrible reload speeds. Wilhelm has Afterburner, which can be boosted to 10/5 with the Celestial Enforcer COM. Right there, you’ve cut your reload in half and have a big boost to projectile speed. Laser Guided also gives him a very hefty +25% bonus damage, which is huge for rocket launchers. Again, I haven’t tried him with Wilhelm, but that is about how I would start working out how to speed up the kills.