We perform 1,000 separate GA searches and record the highest scoring molecule. 10 is found 74% of the time. Thus, one should be able to find the best molecule with 99% certainty by running only four GA searches, i.e. by testing at most 40,000 different molecules. For comparison, we calculated storage densities and back-reaction barriers for >100,000 and >70,000 molecules as part of training and testing the machine learning models and their predictions. Thus, it may be computationally more efficient to search the chemical space using GA combined with SQM calculations rather than developing ML models for the properties of interest.