A correction to the DLF generation routine was made in Service Pack 3 (5.30.03). A logic test was corrected wich could permit negative hydraulic results to skew the generated DLF.

Use 5.30.03 for this.

(This correction is documented in the "build.txt" file installed with the Service Pack. You'll find this listed as "c2pipnet.exe", which is the module that performs this operation.)