Rapier passive are just simply not used, as in their just not a good option, also in addition rapier having the lowest amount of passive compared to any other weapon; their also the most conditional and the less rewarding in my experience at-least and on just raw numbers and what they do how much they last.
Improvements (Now to the main point):
In Grace Tree: (My sight for grace is speed, mobility)
Improved Desperation each time you receive damage , you get a 15% haste that last for 10 seconds can stack up to 3 times, and gain 15 stamina.
Improved Controlled Breathing: Any application of haste last and stacks as one; making any application of any haste refresh the duration of all current haste buff on the player and each of their duration equals the sum of all current haste duration you have.
Improved Perfectionist Every hit that is done without taking damage in the last 5 seconds makes you faster and lethal increasing your crit chance by 9% and haste by 15% staking up to 2 times. lasting for 3 seconds, refreshing each trigger.
Improved Red Curtains Reduce all cool-down on crit by 1% for each and all total stack of haste you have
Improved Swiftness gain 5% haste Per attack staking up to 5 for 5 second.
Improved Momentum using a ability makes you next attack do damage equal to 50% of your current haste.
Purpose; Make the passives more consistent and able to be maintained for it to be useful
Also improve/fleshes out in quality the purpose of the grace tree witch is speed and mobility.
Blood:
Improved Unerring: Attacks including abilities to magnetized aggressively to enemies effected by bleed, making hits less likely to miss.
Ps: (Unerring mean accurate/always right),
Improved Engard every 3 strike gives the player grit to attacks for 1 second, when attacking a enemy with bleed the player gains 10% damage buff for each stack of bleed on the enemy.
Improved Light Edge you attack 5% faster after each attack for 3 second stacks up to 3 times, when attacking a opponent effected with bleed you can stack this effect up a additional 3 times.
Improve Refreshing strikes All attacks reduce cool-down of all abilities by 1%, Also when attacking a opponent affected by bleed gain 5 stamina per hit and steal 1 stamina per bleed tick from enemies, also using finish on enemies steal 0.5 stamina multiplicative (x) by the seconds of the duration of bleed consumed.
Purpose: makes bleed tree literally get improved by having opponents with bleed, makes bleed useful to the player both short terms and long terms; make it more viable for pvp and more well useful when against enemies with massive chunks of hp.
Edit: i edited and remove considering some play styles of rapier and to not make it shred, i change the Momentum ability idea, chill a couple and limited it to movement speed mainly, and did some changes to multiple ideas for refinement of them.