davinci wide gamut LAB CIE in Davinci YRGB Color Managed

[Mani sabri]

Hi every one 

I used to balance and saturate my shots using lab color space on node levels both in ACEs and YRGB mode,

recently I've been grading  in YRGB color managed  using Davinci wide gamut.

but when I want to use lab I get this nasty artifacts all over my shots.

for being clear I'm using Alexa log c footage. my first node is a base grade, second node is just L channel and third node is AB channels.

can anyone help me in this ؟

 

Thanks in advance