...If a stance is weighted forward, ...
I did put "weight" in quotation marks. It's more about the position of the (perpendicular) center line and "feeling" weight.
I am sorry: I can't express better
Well, when researching about torifune I accidentially came across some descriptions of the "bow stance" in tai chi (we have a lot of things in our way of aikido which seem to be kind of "parallel" ... ).
It was quite similar to what I learn about hanmi. Except the direction of the feet. Especially having the (perpendicular) center line not in the middle but in the front third. (was very concrete: 81 to 19)