You're doing the right thing. Maintaining that much leather by hand is going to be one hell of a chore.

The tradeoff with leather protectants is that things that penetrates (oils) are easier to apply, last longer, and offer better protection. But, they almost always change the texture and color to some degree. Waxes are harder to apply and wear off over time, but don't change the color/texture. I think there may be some new synthetic compounds that try to give you the best of both worlds, but my experience using those on other materials (wood, stone, fabric, etc.) is that once you use them, the natural protectants will never work correctly again.