As noted in a seperate post, I have the Brugg RLE. If the sheaves are not equally grooved, the ropes will not keep equal tension. I have a book put out by Brugg and they would be glad to send it to you about a program they call RLP. (Rope life prediction). I do not work for them but I own the product and rent it along with my services.
The facts about replacing the ropes with out doing anything about the sheaves are amazing. With this knowledge, I doubt people would ever re-rope with out addressing the groove depth or fleet angle.
Respectfully Submitted,
Robert L Krieger Jr.