I finally got around to reforging myself a 35 dci boomerang mage weapon today. After 15 hammers I finally got a clean weapon (2 mods counting dci 35 & di 40). I powdered, then brought the di to 2. I added fc1. I went to add mage weapon -20 and noticed the weight would now be 498 if I imbued it. I checked to see if it made any difference putting spell channeling on first. No go. There is no hidden mod (durability/lower requirements). The di, dci, and fc1 count as 3 of 5 mods. I would guess that the fc1 weight counted as 240 pts instead of 140, but that's just a guess. It may be that when I changed the di to 2, it counted the weight as 102. I don't know, and I'm not wasting the rest of my morning to test it out. I just wanted to give a heads up before anyone else wastes their time and resources.