Armament/Imbuing haki:

-Damage increase by 35%
-New haki shield mecanic.
When using Armament Haki and having an empty slot or when using Imbuing and having a weapon in hand (sword, gun, climat tact), you just need to use the right click to activate haki shield (can be change in the key bind option) when using haki shield your character will have a guarding position, during that moment you won't be able to move at all and not being able to use any ability or attack with basic attack (just like when you use Yutai Ridatsu), and during that moment all damage received are reduced by 35%.
Haki shield is impossible to use when you use Full Body haki.
Haki shield is not made to replace tekkai and other guarding ability, since theses ability allow you to use ability while guarding but when you use haki guarding you can't use abilities at all + some guarding ability allow you to walk too something that is not allowed with haki guarding.

Full Body haki:

-Damage decrease by 25%.
-Can't use full body with Armament and Imbuing.

Theses change are made to make people not just blindly choose full body over anything else because it have everything, now full body will be great to tank but will do less damage and Armament/Imbuing will do more damage to make it more appealing and it will be able to tank ability, this is also to make pvp look more like One Piece fight because during these fight only a few character use Full Body haki (Vergo, Luffy in gear 4, Jimbei, etc...) and most character use Armament and Imbuing (Kaido, Big Mom, Blackbeard, Garp, etc...)

Future Sight:

When both user of future sight use it at the same time and one of them get hit by the other by any attack (ability or basic attack) both future sight will go on cooldown
OR
When two people use future sight and hit each other, the chances of dodging ability thanks to future sight change from being 100% and become 50%

Changes for future sight would help a lot, right now only gomu goe, pika magu are able to brute force and disable others future sight making these fruits greatly imbalanced since if you use other fruit your only options to be able to keep your future sight active will be to just run away (wich lead to toxic and boring fights). (I know some fruits can hit even when you use future sight just like goro, but that still leave people with a few options of fruits to use just because some fruits hit even thru future sight and I'm ok with that or just because some other fruit can brute force future sight and I think this is stupid).

Advanced Armament Haki: Emission:

-When using haki guarding mecanic you reduce damage by 55% instead of 35% and you knockback people when they attack you.

This will make Emission more appealing, and make it more defense based (since we firstly saw this advanced haki being used as a defense more than offense) just like making full body very defensive and armament/imbuing very offensive, this will make emission very defensive and internal destruction very offensive, giving a utility to emission.