TBH, sounds like you have issues with your game. I seen and replied in your previous thread as did a number of members that know what they are talking about......switching from site to site is not going to make you a winning player.
Also if your referring to sng's or such you think in terms of # of games, not hands. However if a regular speed game there can be up to a 150 hands in a 9man by the time it ends so you have only played 100 games, maybe 200 if your going out half early and only getting 70-80 hands. This is a small sample, but still if your loosing huge over that sample then its a chance it would be issues and not variance.
For starts FTP is softer than stars, as I'm pretty sure I mentioned in your other thread if you can't win on ftp you should work on your game rather than moving to stars. These are two of the larger traffic sites, especially with regards to stt's, but other options as you mention is 888 or partypoke which have smaller buyin stt's even than the 50c games, they have 10c stts.
Not much else to say really other than changing sites is not going to solve the issues you are having, it doesn't have to do with the rake there are lots of players beating these games for a good ROI over large samples.