As is both perks are very niche and a little weak. I mean over-under is only useful in certain pvp matches or vs lucent brood. Mean while adaptive munitions has the opposite problem, it's only useful during match game and has no useful pvp perks.
So I purpose adding over-under to adaptive munitions. Additionally it buffs damage vs matching sheilds by 15% and the enhanced version simply buffs damage vs any elemental sheild or overshield by 5%.
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Right now, under-over is almost certainly the worst perk in the game. This needs to happen.