Well, I wouldn't be too worried about the response level. Applying over the internet is like direct marketing, where a few percentage point response is great (might you know that already?) So, a reply for every 25 or 50 applications is what you might expect. In the meantime, have you tried a job agency? They will have access to more jobs than a web portal, especially locally.
What I did want to know was what the position descriptions were like: what skills were wanted, desired experience and all that. Were what they are asking for match up with you want to do as a BA?