So sorry about all your issues.
We just support with issues from our theme. With a custom theme, maybe, you can fee for service custom.
#1. WPC Variations Radio: Ok, I checked and it has done.
#2. 14 items/row: Elementor just supports max 10 columns/row, so that, I clone 1 row and setup into 7items/row.
Please check: https://prnt.sc/vmmdxt
#3, #4: I fixed it for you.
Hope will help you and have a nice day!