A convention offers solution
Regarding party lists under PR, right now the parties get to choose how they nominate their candidate in each riding, and the way they do it is usually a nominating convention.
With four multi-member ridings under PR, it wouldn't have to be very different. The parties could have a nominating convention in each riding where the party members choose a list of a half a dozen instead of a list of one and decide the order.
How that works could and should be up to each party. The end result wouldn't be that much different than what we're used to except that we'd get rid of these wild swings where the actual vote doesn't shift much but one party tends take all and shut the rest out. Stephen DeGrace, Stratford