Although I do mine, I think that quadruple ores is overkill, but it's still harder to find certain ores at certain levels. For example, I kept on finding coal and lapis (it got very annoying after awhile) but no iron, gold or diamonds. I tried again the next day and found a half stack of iron and more of that infernal coal. I would suggest perhaps having Andrew experiment with various ore generations. Maybe x2.5 the ores or having them in bigger clusters (with the exception of coal...) and have mods see if that will work.