Worlds 1-3 were really good with minimal sizeable mistakes. World 4 on the other hand went significantly worse. Missed fast cycle on 4-2, 4-4 went very badly and 4-1/Drakken were not great either. You can absolutely save 30+ seconds with a good world 4. Sub 20 is absolutely doable but running against that world 1-3 will be very daunting.