But I wouldn't use discordance for chakram. Only for chakram orb. Not pure chakram. Pure chakram actually is better without Discordance so that it can be affected by MA and EAC (Multi Attack and Extra Attack).
Also less mana costing and spamming chakram already uses a ton of mana. It's very OP though given the right build.
Can get way more MH% than my discordance orb (mainly because orb no longer projectile but also because 2 of the same chakram at rapid speed and whirling blade through periphery.
However whirling blades skill in general just seems to suck regardless of what you do. The only way to really make use was by Periphery Set and fast chakram, even with or without discordance for eg. Periphery Whirling Blades is more Powerful anyway.