My sources are from my "xwb fwbs," and from my my grandfathers. I, too, practice txiv xaiv, so my knowledge comes from my experiences and my education. Whether my sources are of significance to you is.... well.... controversial because how do you know that my sources are a reputable sources. However, I remind you that a lot of our customs have been lost throughout the years. As a result, it would be difficult to distinguish the truth from a modified version or the false version. However, I recommend you ask around. Moreover, I continue to trust my sources because my personal experiences parallel their statements. To this day, I still see moob xiam tuam mas xyom, and they are usually lead by an elder who is a txiv xaiv or one that is very traditional.
I hope that I have provided you with a convincing argument. If not, I still challenge you to understand why moob today still xiam tuam mas xyom.
Take care, and update me if you got any new information.
LV