  Recent variational calculations of the deuteron and the triton illustrate
that simple wave function ansatze become more effective after evolving the
nucleon-nucleon potential to lower momentum (``V_lowk''). However, wave
function artifacts from the use of sharp cutoffs in relative momentum decrease
effectiveness for small cutoffs (< 2 fm^-1) and slow down convergence in
harmonic oscillator bases. These sharp cutoff artifacts are eliminated when
V_lowk is generated using a sufficiently smooth cutoff regulator.
