is there a way to make sculpt texture brushes smoother ?

I am using a multires level 6 mesh here and the artifacts are pretty heavy. Using a normal brush with a procedural texture produces quite smooth results. The texture I am using is a 600 DPI image so it is quite high res.

I could go in an smooth the edges by hand but I rather want it to be untouched.

http://f.cl.ly/items/2i2o460w0L0z1O072K0S/Screen%20Shot%202012-04-09%20at%201.47.07%20AM.png