I've never done a full week of one or the other so I'm experimenting with a week of green. I will let you know how it goes!
I've done 5 or 6 days red with 1 or 2 green...
Everyone is different!
Fast forward is an emergency plan for people who are really, really, really stuck. Not just like a success express boost. It's only available through your consultant and is very restrictive. If you do it, it's only to be done for a week at a time.