First off, as a Command and Conquer fan since elementary school, Thank you for bringing my favorite alien crystal to Factorio!
As the title suggests, I've some complaints regarding the centrifuging of Molten and Liquid Tiberium. Both levels have, not only a disagreeable distribution towards Vitamalange, but permit the creation/acquisition of Naquitite way ahead of schedule. That much Vitamalange is too much in my opinion and I don't think that Naquitite, described as the "Treasure of Deep Space" and, thus, not likely to come into contact with Tiberium, should be acquireable by Centrifuge even at the Liquid Tib Stage given how much sooner one can get to Liquid T than Naquitite-bearing asteroid fields. Then again, Vitamalange is described as a "Primitive space sponge" and given how Tiberium generally reacts with living plant and animal matter, so maybe it shouldn't come from a centrifuge either. Just my two cents on the subject. Execution is entirely up to you. Just a little gripe on my end.