I posted before reading the other posts.
As for the high ore count, I'm sure it's just a small oversight. Maybe someone accidentally put the Big Dig ore configurations into Tekkit, since Big Dig also has super high ore counts, and all ores at all heights.
EDIT: Yup, as I suspected. Thermal Expansion's World config is now configured in such a way that all ores spawn between layers 1-96, and in very high frequencies too. Probably just a small mixup.