First the Galvanized mods and arcanes.
In high level missions, they are technically only useful on meta/top and good tier weapons which can kill enemies quickly. The other weapons in low tier have too little, if any chance to gain the buff from "on kill" condition (and it means on kill with only that weapon). Which narrow down the weapons choice variability you want to widen.
My suggestion is add another condition like a small chance on hit or so.
So the lower tier weapons which take many hits to kill high lv enemies would have a chance to gain the buff (which they are exactly the weapons that need it) too. This also make you gain the buff (which I am sure you need it) in a boss fight without anything else around to kill. So the buff are not limited for only the already-good weapons in the time they don't even need and cannot be gained when you really need. When there is something supposed to make weapons better, nothing within its capability should be left behind by them, even a rivened Stug.
Second, the glaives throwing.
After you adjust the glaives throwing charge time with the reason "to prevent accidental throw" (which does not help much and I know you actually want to softly nerf glaives throwing), the glaives with throw-focus build does not affected much. They can still work fine (with roughtly the same charge speed as glaives without Heavy Attack Wind Up Speed mods before the adjustment) and can still be "accidentally" thrown like just before the adjustment. But all the damages go to the glaives without throw-focus build, the glaive with normal attack builds like Pathocyst. Without Heavy Attack Wind Up Speed mods, they take too painfully long to charge a throw, makes them lost their utility throw uses, destroy the uniqueness of glaive weapons unless with throw-focus build. The thing you want to nerf is not the glaives themselves, but it is the glaives with a specific build.
My suggestion is fix the charge time to be like before the adjustment and, if you adjusted it because you want to nerf the throwing glaives, you can make it gets less (if any) effected from the Heavy Attack Wind Up Speed mods.
So the glaives without throw-focus builds are still intact, saved from the nerf hammer. And you can still do the same effect on the glaive with throw-focus mods you want to nerf
Hope DE and anyone read this will get my point