Realtime GI : Indirect resolution differences between 5.5 and 2017.1

Hello everybody !
I've been using Unity 5.5 for a while and I made a lot of my project in this version.
I recently tried the new 2017 version and I saw that the lighting window change (apparently since 5.6).
Everything look pretty much the same about Realtime Lighting except that I'm confused about the quality of my scene with the Indirect resolution parameter in the Lightmapping Setting.

In Unity 5.5, I could keep my Indirect Resolution at 2 and I had nice glowing and shadow effects like this :

https://image.noelshack.com/fichiers/2017/34/4/1503588464-lighting-comparison-5-5.png

But in the new 2017 version, I'm suprised that I have to increase the Indirect resolution pretty high like 8 to have a nice render like this :

https://image.noelshack.com/fichiers/2017/34/4/1503588600-lighting-comparison-2017-1.png

Otherwise, if I keep the value to 2, I get this

https://image.noelshack.com/fichiers/2017/34/4/1503588709-lighting-comparison-2017-2.png

Everything look so flat and ugly.

Am I missing any new feature from the last Unity version or is this normal ? Because It's increasing the baking time and in complicated scene, it can take long.

 

bump

 

Does your scene scale is same (model's transform scale)?

 

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