Here's a screenshot of what Jon was originally trying to say.

I made a quick eco in Vue 9 giving each plant random prescence values.  If we assume that in the old way a value of 1.000 = 100% then we were able to give values >100%.  Also, if we change a value of 1 plant, the other values remained the same.

This s/shot shows that Vue9 eco material and also saved and loaded into Vue11.   Here, the values are shown as percentages and if I (for instance) change the value of the Summer Cherry to 25% the Fall Cherry automatically changes to 67%.  However, the Long Grass remains at 8%.  If I further change the value of the Fall Cherry to 61%, the value of the Long Grass increases to 14% and the Summer Cherry remains static at 25%.

Changing the value of the Long Grass affects the Fall Cherry above it.

Gill