Right now, doing 100% power up is a silly thing to do by the way. As long as the market price of SBD is > 1 USD, it's /always/ better to get SBD and swap it for STEEM in the internal market (it's better than blockchain internal conversions).

Even when SBD is < 1 USD, I would still use 50/50, and use the internal "convert" mechanism (which by the way is currently disabled in the steemit website due to people not understanding they are losing by using this right now).