Weird FPS drop problem

Hello everyone, there is a weird fps drop problem on my PC here.
- Highest Setting
- Without Ensage, fps is 160~ in the fountain and 140~ in midlane
- With Ensage, fps is 150~ in the fountain and horribly 90~ in midlane
- The weirdest part is, since I am using a 144hz monitor, I can sensitively feel the refresh rate drop. With Ensage, even in the fountain with 150~ fps shown in the top right corner, the refresh rate looks like 60hz. Moving camera, looking at heroes' movement, all like in 60hz.
- Even if I cancel (un-tick) all Assemblies, still got this problem.
- I haven't try to delete all Assemblies, cuz I don't yet want to do all the setup again.
- In main menu, everything is fine even with ensage loaded and connected. Open and close the matchmaking tab at right is smooth like 144hz, so does the in-game setting menu, all good.

So....Is there any way I could solve this problem? or I just have to suck it up.
Please help, thank you so much.

PC Spec
- Ryzen 1800x
- Zotac GTX 1060 3G
- 8Gx2 DDR4 2400

OS&Driver:
- Windows 10 Version 1709 64bit
- 388.71
- DX 11 (In-game and Ensage, both)

Ensage Setup

I have almost the same PC spec, and my fps is dropping hard, amost to unplayable point. It is like that from the very first minute till the end of the game, most of the time it drops to 35-40 fps... Can someone explain what is wrong ?