That new edain mix of those three symbols was one of the most uniqe stuff you have implemented in mod in my opinion.
I personally like it very much, and I agree that Nimloth white tree symbol from Númenorean's shields of second age (and from Lotr prologe) wasn't good idea for period of Arnor kingdom of 1900 year of Third age.
Concerning symbol of white tree, we probably have one thing to think about.
In general, in movies, we have symbol of Nimloth, which is white tree of Númenor.
I agree that symbol of Numloth wasn't suitable as offical symbol for Arnor because of that time gap between Elendil's time and ending ruling period of his heirs in Arnor during 20th century of third age.
Current white tree symbol of tree of Gondor is offical and very lore correlated to Gondor.
It present current white tree of Minas Thirit. As you have said "similar" one existed in Minas Ithil.
But also, every heir of Elendil has practice to use that white tree symbol with winged crown on top of it. So officially from lore, Arnor's ruling members could use that white tree with crown as symbol. That winged crown presents Elendils heritage in general.
White tree without crown presents official symbol of Gondor.
So that was a small note, and I comletely understand new offical symbol.
One question from lore, those birds on elite units and their armor? They also appeared on Faramirs weta designed shield. What they represent?
Now concerning current Arnor units, I find them very nice, and it is noticeable that team have invested a lot of effort in them. One thing which should be improved is model of Arnor spearman (or pikeman). They look really desoriented with their animation, and their current model should be improved with some longer and better spears.
Current spears are too short, and their attack and moving animations are very "unusual".
Simply Gondor corresponding unit look so much better in comparison with them. That is probably only model cosmetic thing I have found really bad in this current Arnor faction.
Arnor Spearman should be improved according to standard of this mod in my opinion.
If I look out of this topic, maybe somehow also to try to make some better palantir portrait of Araphant and his model to improve also. That's all concerning Arnor in general which isn't on Edain's famous detailed level in my opinion.
P.S. I have wonder, some new heroic unit for Arnor is needed. To correspond to Gonor's Guardians of the White city. Have team thought about Guardians of Annúminas, which were suggested by BalkanLuka some time ago on modb? I think that suggestion could be nice stuff to think about in this way.
They could probably correspond to Guardinas of the White city in the situation when Arvendui gets ring?
(Maybe to rename them to Guardians of Fornost because of time/lore facts etc)
Regards,
CragLord