I largely agree with your entire post, with this exception: I don't want to see URs and wrong edges penalized more harshly than they already are, unless falls become more harshly punished as well, proportionately. A planned downgrade fall is bad, but so is a planned fully-rotated fall (such as Yuzu's 4S in 2014). A nicely landed UR or wrong-edge jump should always be worth more points than a rotated/correct-edge fall because it doesn't have as large of a negative impact on the performance.
Well, that goes without saying that falls should be punished more harshly.