The site in question is http://www.high-rollercasinos.com which was ranking badly for the term high-roller casinos, about position 43, then jumped to position 3, held it for about 2 months and has now plummeted down to about position 50. As said the only thing that changed apart form me pumping in loads of unique content etc was that I changed from a shared ip address to a dedicated ip address. The site itself should be fine I always check for 404 errors etc and it is doing fine at the moment although it does show a lot of page not found errors from around the time I switched the ip addresses over which is a bit odd. I have designated a primary host and all the other things so that’s why I’m at a loss. If it is a case of Google rechecking my site and deciding its crap then I might as well just give up, because if adding unique content and getting links is wrong then I’m not sure what I should do instead.
One potential problem I thought about is that the content is still available on the original shared ip address, that is how dedicated ip addresses work I think, that they are basically just a redirect. Hopefully Google will figure this out eventually like all the other bots already seem to have done!