Sad to hear you still stuck with this, but I can’t see how to help more about your specific case on the forum.
May be in a near futur... (I’m working to setup a free weekly consulting session) ;-)
You should try to create a playground (local demo, demo instance, etc) and install and experiment the profile. You may need to note each step of the installation and then try to reproduce (on a clone of your main website).
That’s what I did for and used in a Tiki19.
See the background of the video and you’ll see a functioning Tiki cart.