Our own job links page is a wee bit out of date I think:
http://raoulschinasaloon.com/index.php?topic=86.0What you are doing already seems about right, that's just how it is.
As others have said, your qualifications, experience and preferences are going to have a big influence on what jobs you are going for, and that will in turn influence which websites we might recommend.
There are generally three types of jobsites IMO:
The catch all places like DAVES etc. where you have to sift through the dregs in order to find the one or two good ones.
The local websites like Shanghai Expat etc which may have some gems but only want people on the ground, often want you to sort out your own visa.
'Serious' job boards for linguists, international school teachers, uni' subject lecturers and the like - better jobs but higher demands in terms of quals + experience.
To be honest, like teacheraus said, a lot of the good schools/jobs never advertise because people hunt them down or they have people recommended to them. Being in the right place at the right time or bumping into the right people (i.e networking) also gets people jobs they might not otherwise have heard of, or even on paper be qualified for.