First of all, thank you for organizing and posting all this Imbuement information. I have not imbued my FA weapons yet, but was looking at the official forums and saw a post claiming:
The system currently divides item XP among all legacies, even ones that are already maxed. They say this is working as intended but it seems like they're just accepting a broken mechanic to me.
https://www.lotro.com/forums/showthread.php?568613-ixp-on-imbued-weapons&p=7367181#post7367181
Is this true? I thought from what you'd written that if one tier is capped the IXP will distribute to the other, non-capped legacies. But this seems to indicate there's a problem and the IXP is still feeding into the capped legacy. It would be good to know if this is the case or not.
Thanks again!