Hello Jo jo,
I personally went to stage 2 when die-off was completely over; I feel that this is the safest way to proceed so that you feel confident that there won’t be any problems later on.
However, its up to you on what to do of course and when to introduce foods, etc. I believe millet is probably one of the safer foods to choose from as well as flax. Their benefits probably outweigh any detriments.