i would agree w/ erik, and disagree with ihocky;
although it makes sense to want the strings to pull the neck, its not something that should be that quik;
loosen the strings, do the 1/8- 1/4 turn;
tighten strings and play around with it; it may seem right away that othing happened but after a lil playing and time , the neck will slowly(properly) give more releif with the strings pulling over a period of time;
like bending sides, if you do it slow the wood ''naturally'' finds it place; if its rushed it will return to where its been for a long time