Thank you.
Amros is also attested in a text dated from 1968 or later (in any cases, after the
Shibboleth of Fėqnor), cf.
The Problem of ROS.
I have not found another references of
Amras in HoMe X, XI and XII that don't belong to LQ2 or to a later text.
(Moreover, what do you think about the 'five sons of Fėanor' mentioned in HoMe XI p. 329 ?)
aravanessė