This isn't a nerf cry thread just to start off, only suggesting a few ways to tweak how the grenade re-charging works with both chest pieces.
PvP: These two chest pieces need to be tweaked. When you see Sunsingers spamming fusion grenades with Voidfang Vestment, or Blade Dancers just spamming sticky 'nades with Lucky Rasberry, it really ruins the fun in PvP. A simple way to adjust these two pieces is make the grenade recharge specific to their grenades they enhance upon respawning. So if you use a grenade OTHER THAN Axion Bolt or Arc Bolt, your chestpieces won't recharge your grenade energy.
Now for a PvE/PvP buff: This is just so that you don't have to kick the bucket(die) in order to get your grenades back. The death recharge still stays, just so that you can keep the feel of being a grenadier upon respawn.
Since Voidfang Vestment spawns two Axion grenades, if you get a kill it'd recharge 45% of your grenade energy, thus getting two kills would grant 90% recharge. Now if you just get hits, per hit it'll recharge like umm... 20%-25%? I dunno, but somewhere between 20%-25% would be reasonable. For Arc Bolt since it can chain 4 hits, I'd probably go with 10%-15% recharge per hit, and per kill I'd say 22%-23%.
*Scratched* After a suggestion, I scrapped the idea of discipline for both chest pieces.
I'd say these are a few ways to not only balance out PvP, but also to beef up overall usage of the chest pieces between PvE and PvP.
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Asking them to be tweaked to be less useful than they are now is still called a nerf. I say leave them alone