I would propose a solution for the whole "Strands of Adamantine, which has 0 elasticity" thing.
Adamatnine atoms naturally align into strand-like molecules when allowed to coalesce over long periods of time, which produces natural Adamantine strands. These strands are like silk: extremely soft, stretchy, strong to the point of unbreakability.
When dwarves create Adamantine wafers/bars/blocks, the thermal treatment causes the atoms to become misaligned and of a more crystaline nature, which has absolutely no yield, and would thus be very brittle, except that it maintains its unbreakable nature. Because certain criteria are required to form Adamantine strands, the transition is effectively one-way.
If you think about the whole "Adamantium=diamond" thing, this actually makes sense, as carbon fiber is very soft, flexible, and strong, though with very little shear-strength, while diamond is extremely hard, but brittle.
So an Adamantine sock would be woven adamantine fibers, an Adamantine breastplate would be forged crystaline Adamantine, and an Adamantine bow would be like a compound bow, with the solid parts made from crystaline Adamantine, the string made from Adamantine fiber, and the elasticity granted by using Adamantine fibers as tendons to the crystalline Adamantine frame.