Lighting and texture scaling seem way different. Other than that, bump mapping is as usual used “wrong”. Leave the effect at 1, and control its distance. But a distance of 1 means 1 meter between black and white, so it should probably be 0.001 (1 mm) or less, but can’t be sure without seeing what information is in the bump and normal map. When I want to use bump mapping, I always try it out first as adaptive subdivision and displacement. If there is an AO map, I might use it (or bump if grooves are here) on the specular. I’ve never used Octane so I don’t know how it’s hooked up.