I think what you need to do here is create some formula checkbox fields that are used to drive the display logic. That way, the logic in the form rules for what to display will be much simpler, and you have a layer to hide that complexity. have a [Display xxxxx?] field for each field that you need logic to show or hide on your form. Set up an If statement in your formula for each to encode your business logic for whether or not to show or display it, based on the selections in the other field(s). Then set up a dynamic form rule for each Display formula checkbox field in the when part and show or hide that field accordingly in the Action part. That way, you won't be setting up multiple dynamic form rules that contradict each other when more than one refers to the same field. The only limitation here is that you can't have more than 20 dynamic form rules per form.
