I got a proposal, i think this might actually boost your daily giveaway dynamic, and in the process it might save you even more time. How about you set a contest to pick at least 7 curators from the regulars, then you could schedule on a weekly basis a set of themes for users to write about. Curators should determine by consensuss of 4 votes out of 7 the 2 winners of the day.

Also curators should comment and justify their decision based on solid arguments, they should give participants good feedback so the latters could enhance their posting quality. I suggest that curators must post on a daily basis about the scheduled topic, thus they would also teach by the example, finaly curators should have granted an upvote from you for they daily post. Of course, the full voting power should go to the newcomers, curator's post might be around 85-80% vote weight.

If a time come when a curator post is overwhelmed in quality for one of the newcomers, you might offer to him the curators position, or you could figure out something else. What do you think? I bet this might skyrocket this explendid iniciative of yours.