These numbers are from the head of sports nutrition at the AIS (Professor Louise Burke OAM, PhD, B Sc, Grad Dip Diet)
percentages are not very good when it comes to meeting minimum nutritional needs, a person on a low calorie diet and basing nutrition on percentages is likely to be not meeting minimum nutritional targets, just because somebody needs less calories over all does not mean they need less than minimum protein, this is at its worst for those who have a low calorie intake normally like many smaller ladies (not your situation)
There are also other factors influencing protein intake needs, I shared an article about a month ago which in part looked at the increased protein needs of people looking to loose fat.
The Metabolic Adaptation Manual: Problems, Solutions, & Life After Dieting take a look at the scientific papers referred to in this portion of the article regarding protein intake. However the whole article is worth a read, as it covers a lot of factors in weight loss and explains the hormonal aspects very well.
I think the suggestion in the article of "
2.3-3.1g/kg of FFM scaled upwards with severity of caloric restriction and leanness." is not necessarily a good match for many on this forum as the study was done on lean athletes rather than the mostly sedentary general population but aiming for the higher end of the ranges I first posted would still be a good idea.
your right, Electronic impedance is not very accurate but are ok for tracking progress if measurements are done under the same conditions each day. Morning before eating but after emptying your bladder is a good time to get the best results, hydration levels can have a big effect on the readings.