There is a tremendous science to bearings and gears. I've been involved with these details for many years in aerospace. Some drive transmissions I've worked have lasted over 20,000 hours in tightly optimized packages. Coatings and precision is everything in the world of longevity. I would be happy to share some wisdom. How about a coating that is 95 Rc hardness with coef. of friction at 0.09? Chrome is 70Rc and 0.2 coef. Friction. Chrome also likes to peel and Flake, especially at high temps. Gear cutting techniques like undercutting of the pitch diameter do worlds to reduce noise and heat. Some nicely ABEC classed bearings can handle very high loads at very fast rpms.
Regardless of the endless possibilities in refinement, Australian guy already ran a 900 hp triple, now he is setting up a Quad turbo rotor based on previous success. I'm sure he dealt with many naysayers along the way!