Tarpit (firm or standard) is the ideal stego for me as well though I typically just bag my beat RFF Tarpit. Something about a really stiff stego just doesn't feel right to me, I have yet to try molten. (I just ordered end of last week, I should have added one)
Unless you dislike the feel of a beat in disc, its not like the flight changes a ton until they get really beat. For instance see the fossils that beat to be domey and straight early in this thread. my experience is tarpit gets more puddle topped as it beats, which is almost a bummer cause I really am curious about a berg like stego