What are you using for "Healthcare System Capacity". I think the value is too high (25%?).
All other parameters included in the model have much more complex effect on the growth rate.
The numbers of the days in the x axis follow a strange pattern. What about using the multiples of 5 or 7?
If I change the number of "Random People Met Daily" to 1, the peak of the curve is outside the range of the graph. I guess the scale should be configurable.
The number in the "Close Circle Size" is used to simulate small clusters, or each day it is used to pick someone at random from the population? (Does each sim has it's "family"?)
The close circle size is the family/close friend size. In actual scientific models, this is a decimal value to represent the average of the community, but in this model, I kept it as a whole number to simplify my calculations. If I get a chance, I'll improve this further.
Anything that falls into more than 150 days is way beyond any sane model can predict. Cutting the "Random Contact" to 1 greatly drops the rate for at least 150 days - this is exactly the point of this model on showing how important it is to reduce social interactions.