I decided to test the effectiveness of these boots and found out that the grenade charge take 30 seconds regardless of your discipline tier. The melee appears to get cut in half as intended but honestly they're pretty useless without the grenade cooldown as well. Hopefully they know about this and are working on a fix, if not, hopefully they see this post.
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I saw a streamer test these and it cut his grenade cooldown by 6 seconds