How to upgrade accuracy of quick selection tool (GOAL: infinite white background)

Hi,

I'm a beginner product photographer. I made a 360 view of the products (which consists of 72 frames/pictures) and 6-10 still pictures. My goal is simple: Make the colours as realistic as they are. And achieve an infinite white background. I use the Panasonic LUMIX GH-5 camera. I've set the "spot" light measuirng (I'm sorry if it is not written correctly - I don't know how to write it in english) and sometimes use "highlights" set to maximum. If the product does not contain any bright colours it brightens the background. BUT inspite of all the eforts the background is only white. Not "infinite white" (as the background in the web browser). So I've started to use Photoshop batch editing to replace the background. I use the quick selection tool and the "select subject" function. It works really well unless the product contain white or very bright colours. In that situation batch editing shows many artifacts in the effect. Here You can see example gallery of 360 view (the effect I want to achieve in all of my products) and in the thumbnails You can see my efforts and the artifacts.

https://embed.imajize.com/4463336

Pictures list:

1 - my best effort without ANY postproduction

2 - I was trying to change white background to some darker one to make more contrast between the product and the background - but it doesn't help

3,4,5 - artifacts due to "select subject" not working very well with bright products...

6 - my simple studio (6 bright LED - two in front, three on top, on in the background)

Is there any way to upgrade the accuracy of the "select subject" tool? I have a plenty of computer power. So resources won't be a problem. Is there any different way to quick select the white products which I could use in batch editing? I tried to manually fix the corrupted pictures. But in white products most of pictures are corrupted. And manually fix ~80 pictures takes way too long.

Also I have some problems with the colours. Most of the colours out of the camera are great and looks like in reality. But some bright tints of pink, fluo-yellow, fluo-green does not go out perfect. Maybe someone has an advice what I can do/what settings use in my camera to have a better effect?

Will be glad for any help!