Congratulations! You have entered one of the most infuriatingly segments of Parrot Ownership.
What you will find is that the more you search the more confusing the information becomes. Add to this frustration is that near everything you will come across is based on a known serving, per Parrot, per day, which is a common method of feeding at Zoos and Sanctuaries.
You will also find that in the vast majority of studies and writings is that Pellets should or do make-up the vast majority, if not 100% of what is feed. So, unless this is the method of feed that defines what you are or will be feeding, you are left to complete extensive calculations each day as to what you are feeding and how close you can hit the targets.
Adding to all of this, as you have already found, the requirements change from species to species and time of year.
I completed a like study several years ago for Amazons and provided what I found and feed for your Amazons. My goal, was to provide a well rounded diet that was as near to what an Amazon would find in their Natural Range and add pellets to augment that base.
All of this and an every 'nine' month full blood screen that allows adjustments based on the findings. For healthy Parrots, I recommend a every 'fifteen' month blood testing. Over four to five years, the testing sees each season of the year and notes variation that may naturally exist.
Insert: See Amazon Forum, I Love Amazons - ... Thread and then the Segment of what to feed an Amazon or like wording.