How can i get full control over mesh opacity created in Substance Painter?

Hello! Sorry for my English, i’m not englishspeaker, but i learn it now.

I have one-polygon mesh using as plastic glass over display.
In substance painter i created opacity mask. You can see it in first screenshot. How can i apply it in my UE4 project? I use substance material generated in Substance Designer. Designer automatically set opacity mask to “opacity mask” socket in ue4 material (idk how it calls), but as i know, opacity mask works only with fully-white and fully-black colors igonring grayscale valuation.
Ok, i tried to set blending mod into transfluence mod. But in this case i lost abilily to use roughness map and normal map. Moreover, the mesh stoped reflect light. It looks so bad.
I tried to find best solution, changing all parameters in my material, but best i reached you can see in second screen.
What the best way to do it? I really want to see my Substance Painter result in the UE4. I know, maybe this glass looks not so good, but i’ll tweak it later. Now i want to get ability to make it better.

Screens:

  1. How it looks in Painter;
  2. How it looks in UE4;
  3. Material in UE4

http://joxi.ru/nAyoOpluXoLNam.jpg

http://joxi.ru/52aExXWcGK5QO2.jpg

http://joxi.ru/82QEbjJc1ekzk2.jpg

I don’t know why, but my screens are gone.

http://dl3.joxi.net/drive/2018/04/10/0021/2922/1416042/42/c321e727ff.jpg

http://dl4.joxi.net/drive/2018/04/10/0021/2922/1416042/42/6ce303f02b.jpg

http://dl4.joxi.net/drive/2018/04/10/0021/2922/1416042/42/aaf8adfd65.jpg

I think i got it. I selected “Surface TranfluenceVolume” in Lightning Mode and it works. Looks a way better, but not great. But i think it’s because of lightning.

http://dl4.joxi.net/drive/2018/04/10/0021/2922/1416042/42/f469887003.jpg