I've been doing SEO on a lot of sites that are at least 6 months old, some older. I've been pointing variety of links including even very high quality links. It seems like after a high quality buy I might move form position 70 to 40, but then back to 55. This seems to happen over and over, despite how many links the site seems to be gaining. Anyone else noticing this effect lately. Any tips to speed it up?