Share 'Dealing with mold release marks'

I'm finding that all of my 1 oz bars are getting mold release marks once they are set up.  I'm positive they are the artifact of slow/uneven cooling (as per some good tips/advice from a member here), but it seems that no cooling method I try gets rid of the marks.What is the preferred method of cooling solid bars in the absence of a cooling tunnel/cabinet?  Thanks in advanceMike