My suggestion is to not add improved enchants to the game not weapon not armor.
They don't bring anything good but make the game worse all they do is destroying whole proces of updates and progression, for example what use is an update were you add A grade and there is no reason to farm for a grade weapons because market is full of b grade + 10 or more that are easier to enchant or buy.
Also it breaks the game from the core, because if ppl have 10+ B grade they can solo farm almost anywhere, so the game is more profitable to play solo with boxed supports, as we can see today most players have access to at least one more pc or laptop so easy quad box, so this lead to ppl playing supports quitting and adena farmers thriving.
As well server looks like high rate star wars and make any new comers not even try .
the lower the average weapon over enchant is on server the better for long term stability, balance, update hype and progression.
I would suggest to replace them with solid enchants but only D and C maybe in the quest from strix or something accessible for everyone. Obviously in next upgrade not now so any new comer, random player can get easy +6 C grades weapons jewels weapons while top players will have B grade so they will have their advantage for the hard work to make B sets +6, this will keep some kind of balance of the game and won't create a massive gap between top players and medium low .