I am sorry, but you suck
Because the data on interracial reproduction are only valid in the context of postzygotic isolation if you can adjust for all discriminatory, familial and other socioeconomic factors.
Furthermore, your anecdotal evidence of increased difficulty of interracial births is correctly interpreted as a maternal effect–not as F2/epistatic breakdown–and is inconsistent with the timeline of divergence of human “races” and the evolution of prezygotic isolation mechanisms due to the pressures of postzygotic selective pressures. If interracial breeding really had such a high postzygotic expense, I think we’d have speciated by now.
Moreover, I present as anecdotal counterevidence my white cousin and his Korean wife, who just popped out spawnling #5.