I'm glad that you like the concept
Regarding the Ring forms, I chose the solutions I deemed suitable for such particular cases. I know that Narya being enhanced by the One Ring or being turned by it into a dreadful flame-emanating tool are something that stretches the lore considerably, but you have to bear in mind that Ring forms are highly what-if situations themselves. Henceforth, what I did was finding a decent result that would do justice to the gameplay (people always expect unique things, once the One Ring is found).
In a purely game-oriented perspective, the One Ring thus mutates the nature of Narya and transforms its secret fire of endurance in fire of destruction (the way the Evil uses this element on a regular basis). Nenya too gets really destructive, if it is in the hands of the Dark Queen; or, just like Vilya was able to conjure a massive tornado in past versions of the Edain Mod, when Elrond wielded Sauron's evil artefact. I thus find these suggestions more than legitimate, especially if they are applied to the exceptional context of Ring forms. One should nonetheless remember that Ring forms are not the norm in the game, and having Narya be marred by the One Ring was definitely not the main priority and purpose of mine, while conceiving the whole proposal