Up until now I've done keyword research and then filtered keywords depending on search count and KC to get the list down I've then manually checked to see if I felt I could get a top 5-10 placing. I've sitting in 2nd place for a decent keyword phrase, and according to my notes it had a KC of 23. I've now checked again and it's come up as 42! So I've got 2nd spot with no backlinks at all and it's been in that position for a while. I'm wondering if there's any point in checking the KC because 23 to 42 is quite a leap. But I could do with some sort of filter(s) as otherwise I'd be manually checking thousands of keywords/phrases! Is KC not worth checking, as it seems to me like it's pretty random!