Hello.
I gather that you have a number of fine principles. The problem with the principles, and indeed it's a problem of deciding the system in general, is that you have competing principles at stake. If you have to ditch one, then I would say ditch simplicity. We're only likely to get a chance to fix the electoral system once in this generation. Don't go for a system that is easily explicable to people who in any case aren't currently engaged. Go for a system that will do the best job, and go for a made-in-Canada solution that solves as many of the problems as you can at the same time. For example, try to work in better regional representation. I would back the single transferable vote, but that clearly doesn't work for big areas with low populations, so work on that. Come up with a workable compromising solution that other countries haven't tried before because they haven't needed to. Similarly, work on having better representation for first nations people, women, and other minorities. Build that into the system by, if necessary, coercing parties into making lists that better represent people in the system you choose.
My point is these ideas have not necessarily been tried elsewhere, and they may not be easy initially to sell to people and to explain to people in a form of a referendum, for example. That's why we have representative government. You guys have been doing a lot of thinking. You've been talking to a lot of experts. The public has entrusted the government, broadly speaking, with a mandate to change the electoral system for months. For my money, that's good enough for me. I have a Ph.D., and I care about this stuff. I sat down and looked through the material, and I found it quite difficult to come up with my own idea of what I think these things should be. Asking the Canadian public in a limited scope of time to look at what I hope would be a reasonably complicated proposal is just too much.
If it turns out you come up with something that is really difficult and that the public doesn't like, then the public is perfectly entitled to turn around and vote to go back and choose something else. That's where I put my priority.