For one you are getting 40 leads per ad, that's good.
Two, you probably want to change your e-mail response a bit.
140 clicks out of 400 leads is okay, but you can work that.
However, what really sucks is your conversions.
The CL jobs method is saturated, so you will have to twist it and come up with your own style.
Like the above poster said, just get a better offer