First off I know this is going to sound somewhat picky / retrogade. Sorry.
You need to know the temps inside the hides where the snake actually spends its time. Discountinue the night time drop - it's doing you no favours.
If she happily eats live mice then stick with mice - they smell more. Though I do realise they are a lot harder to get hold of
They can be tricky to move from live to f/t there is no doubt about it ( and it sounds like you have tried most of the advised tips ) - the only one I think you missed in fact was a fake mouse nest in a dark tub.
I know it is the last resort but smetimes skipping a weeks feeding is worth trying just to put a little edge on their hunger. But obviously this requires weight, conditioning and sensible thought. I would email Brian and ask for specific adice on what to try - at 550g it obviously ate for them so any hints they could give might help.