Profile, messages, bookmarks and preferences Question about stacking Relic Sets effects

Now that Vykas release is set in stone, i guess no one will need to theorycraft much anymore about mixing a bunch of settings and instead just plan to go full 6 pieces in 6~7 Weeks. That being said i have some doubts about how the effects stacks up going from 2, to 4 pieces and to 6 pieces.

The sets i’m most interest about as a Zerker Technique are Dominion set and Nightmare Flower set:

I’ll copy paste what their effects here are

Dominant (Dominion)
    Notes: Can be used by Berserker technique zerk, Battlemaster. Supports used to use this
    2 pieces: Awakening damage decreased 50% but can be used 1 additional time with the cooldown being reduced by 20%. Gain “Inner Awakening” buff for 2 minutes upon using an awakening. “Inner Awakening” buff reduces cooldown on all skills (excluding awakening and dodge) by 18% and increases skill damage by 10%
    4 pieces: Awakening skills can be used 1 additional time (total 2). “Inner Awakening” buff is enhanced to 18% cooldown reduction with a 25% increase to skill damage.
    6 pieces: Awakening skills can be used 1 additional time (total 3). Dodge cooldown reduced by 30% and increased damage of 15% done to all enemies for 2 minutes.

AND----------------

Nightmare
    Notes: MP consuming classes can use including Glaivier pinnacle
    2 pieces: Reduces mana usage by 50%. Skills that consume mana will have 12% increased damage.
    4 pieces: When a class with mana uses an Awakening, “Mana Poison” effect is gained. “Mana Poison” effect grants an additional 15% damage at the cost of consuming 7% more mana. When mana reaches below 30% while the “Mana Poison” effect is active, “Mana Poison” will turn into “Endless Mana”. “Endless Mana” effect will recover mana 3% every second, Decrease skill cooldowns by 20% , and increase movement and attack speed by 12%.
    6 pieces: “Mana Poison” deals an additional 15% damage. “Endless Mana” effect’s cooldown reduction is increased by an additional 15% and movement and attack speed an additional 3%.

I’ve been said those effects “stack” but it is a loose term and i have a few doubts. Assuming 6 piece, the Dominion would give me 18%+18%= 36% CDR when the buff is active? with a +30% on space bar, and 10%+25%+ 15%= 50% damage increase? The line says " “Inner Awakening” buff is enhanced" so maybe the second effect just overwrites the first becoming all around +18% CDR and + 40% damage?

For the Nightmare Flower the 6 piece would give me 12% DMG flat, + 30% when Mana Poison is active and when Endless mana is active i still have +12%flat and + 35% CDR + 15% atk and move speed?

Please only answer if you are certain about what youre saying or can test in other versions of the game, right now i have heard too many info and nothing is clear enough. Thanks in advance!