Self Chill with Lethe Shade

So im playing a self chill "the fulcrum" build and i was wondering if i can extend the chill duration from 4s to 8s with the Letha Shade Keystone. After some tests i dont see any diffrence.

Now my question:
Is it bc of fulcrum or is the keystone not made for it.

So I think this is because you are getting a reflected ailment which has its duration set by what you apply in the first place - so you could make it last longer on you by increasing your ailment duration on enemies but not something like lethe shade.

I'm sure someone will correct me if i'm wrong on that but as I understand it reflects don't get modified further after being reflected.

Sounds fair to me. Just a bit sad bc i dont see a lot of people using Lehte Shade and it would a awesome synergy.