I have not done simulations for Canada yet because it is a lot of work, one week of full-time work, in fact. I did do tests for Quebec though. When there were fewer than six, there were serious problems with electoral thresholds. It was like a staircase. Actually, it is regional variation that creates proportional representation in such cases. Sometimes there are up to three.
The problem, however, is that a person can say that their vote will never count in their riding. The number three will occur frequently in Canada. It will even be one in some places.
I can understand that people are not happy with this. I had the idea of applying less proportional representation in rural regions because, with a majority vote, the degree of proportional representation can be varied, with more proportional representation in urban centres. We would be closer to the regular vote in rural regions and further away from it in the cities. That is one possibility.
I know that, in Canada, having six or more is not feasible. As I said, it is one of the worst places in the world for it. It was not easy in Quebec either. In Canada, 50% of the population lives on 1% of the land area.