Previous experiments have shown that the population constant doesn’t particularly matter in Ms. PacMan, assuming infinite iterations, but they do matter in Blocks World. Or at least in module creation. One of the problems seems to be while creating the clear module, which creates a sub-optimal module due to the elite samples can be so unstable.
I think it is safest to leave the population constant at 50, which is a reasonable number of samples for Blocks World. The only problem is that of Ms. PacMan which requires many more elites.