Hi I have an aged website which does OK for a number of keywords (top 10). I have been trying over the last three months to rank a different k/w of medium difficulty. Taking a longer term approach I have been building slow but steady links (15-30) a day, with a variety of types used. The difficulty I have is that (using serpbook) my rank can vary by: day 1 - 50 Day 2 - not in top 300 Day 3- 50, later in day 3, not in top 300 day 4- nt300 Day5 - 32 Day 6 - not in top 300 and so it goes on and on. How can I stabilise this?