Guys, i've got a little solution for my problem:
http://talk.maemo.org/showthread.php...ght=swappiness

Changing swappiness to something around 0-20 makes my RAM most of the time at 70%-90%, wich is cool.
Also, it looses less time doing swap...

I have stopped the tracker indexing too:
http://talk.maemo.org/showthread.php?t=61440

My device is responding better and the battery improved dramatically!