Canon Pixma MG 8150 with OS X 10.14 Mojave

Hello,

Canon stopped good working printers with "Fehler B200" called "printer death". Some month ago I could revitalize it. But now, all seems lost. After MG 5350 I could buy an old MG 8150 to use my ink storage. 
But Canon does not support OS X 10.14 and the old driver didn't work at all. After three days of searching I found Guteprint and was very very lucky! So I hadn't to throw away a good working printer. Thank you!!!

Now my question:

1. I can't activate the back paper tray

2. when I use "Label print" for CDs it uses the back paper tray.

Is there any solution in sight for this problems?

Thank you an kind regards

Henry Guanter