hey brian
if you can’t work with layer control, i tend to copy&paste every time as well..
if you ctrl-select all your propertys on your layer with expressions and then right click to them you can choose “copy only expressions” (may be named differently since my AE is in german).
then you ctrl-select every layer you want the expressions on and paste them..
you just have to write the expressions as open as possible, that you don’t have to go inside each layer and correct numbers each time..