Headscratchers / Alienators: Evolution Continues

• With how often the Genus evolve an immunity to Ira's latest mixture, why doesn't Ira simply make several new formulas in advance instead of having to make a new one on the fly?
  • It's implied a few times that each new formula needs to be tailored to the situation at hand. To be fair, since each new formula only takes a few seconds to make, the cartoon does often give the impression that new batches are made at random.