Hallihallo
Thank you for you replies. I asked a GM and he told me that as long as I don't take a NM placeholder or a NM itself it is a valid strategie to skillup my parry.
Now the details I left out before:
I never wanted to go to blue max parry skill on my THF75, only up to 211.
My setup (Sabaron can read minds

)
-20% Damage Weapon: Earth Staff
1HP/Tick Ranged: Snakeeye
1HP/Tick Body: Dusk Jerkin
1HP/Tick Neck: Orochi Nodawa
1HP/Tick Head: Presidential Hairpin
1HP/Tick on Daytime Hands: Garden Bangles
2HP/Tick lower 50% HP Waist: Muscle Belt +1 <-
+1 gives 2HP/Tick seems to have been changed to 1HP/Tick
1HP/Tick Subjob: BLU with HP regen
(Not WHM because of the staff skill = "fast" dead monster)
Monster: Mauriche/Mandragora in the Boyahda Tree to get me up to parrying level 211, as well mandys sometime use regen on them.
And I think it is still risky at that enemy. I will see If I am still alive when I wake up tomorrow. XD
Edit: Do not use Monsters that have Posion 2! XD
Nice Day
Nomido