source pull in ADS need help

Hi friends,
Always we need do load pull simulation firstly and get the optimum load,and secondly run source pull simulation.My question,how to set Load impedance when i do source pull simulation?I need set it optimum load or other (considering Harmonic pull)?
Thanks,

Of course use the 'optimum' Load,
maybe after your source pull, you should do load pull again, and them source pull again and again

iteration may be necessary...

Thans，totowo.