The process will be way more efficient if you swap STEEM to SBD in small amounts at a small interval (few minutes or hours) instead swapping all of them at the same time each few days. Liquidity of the internal market is not very good and the efficiency will get hurt worse as the pool grows if it stays this way.

Please set up a bot to swap a fraction of the STEEM pool to SBD at a small interval so the initiative become more efficient.