Well - an update for all. I made a plain well known flat out onpage change to a site of mine which was at position 38. After the changes were updated and cached - the site is now sitting pretty at number 4. Still a bit to go but thats a great jump.
I have today made the same change accordingly on 20 domains and noted the current position if each in the serps. This should be good - some of them are at 15 to 20 so if things work out they should easily jump to page 1 and high up. (especially considering the utter drivel that google currently ranks!)
A couple of changes phrase based and including a few "LSI" type words (but not LSI is it ;) should see that first site pip the post to number 1.
Ill let you know.