I'm attempting to use the Spline Models functionality in FEFLOW 8.1 for unsaturated flow. I've started out with a test case to compare against simulation results using the Modified van Genuchten emperical model. My spline model results don't match my control case. What am I doing wrong?

MVG parameters:
alpha = 0.03
n = 1.964
m = 1-1/n (0.4908)
delta = 1 (Kr = Se)