Well in Xposed you are able to get the logs pure of the Xposed modules. And have you tried disabling all the modules and enabling it one by one? To be sure that it it really caused by Xposed G-Touchwiz?
If you could first check if the problem really is made from enabling Xposed G-Touchwiz then please provide me with the Xposed error log.
just now i turned xposed g-touchwiz back on and pie is working now. everything is working fine, no more check yo this and that from samsung, thanks to Xposed G-Touchwiz
but i also reinstalled piecontrols from TB after i had supposedly found the culprit this morning. then I disabled g-touch til just now.
now everything is good.
sorry about the false accusations on your code , maybe it was pie all along and the reinstall fixed it.