I also tried, after extracting the apk file to put the icons manually with the g2 xposed app. Totally distorted and a little bit blurry. I also tried to change the resolution each of the icon files - did not help but it worked with the one m7 icons very well. The circle one does not look like a circle but like an egg
I wrote an email to the developer. Hope he can find a solution.
@vPro97 Is it possible to use your apk with the g2 xposed one? I cannot get it transparent.