Begin with Strictness parameter set up to the value of 0. If there are not too many resulting clusters for the intended goal or the curves in the clusters are too different, then increase the parameter value gradually. If necessary proceed up to the maximum value of 99. This way you will obtain increased number of clusters with more similar curves. It is only the user who determines the number of identified clusters and the intrinsic similarity degree of the curves in the clusters is acceptable and convenient for him.