Try playing with the "similarity" and "gamma" settings in virtual desktop. I have had luck removing the aura outline fine tuning thouse. It should help with outline issues and bleed through. Also you should check out vamx. There's a light section that allows you to change the lighting with one...
I have had issues with a aura that surrounds the character. Then when you get rid of it you can have bleed through in some eyes or clothes. BUT! I have found 0,80,0 so all 0 except for green set to 80. So simple but fixed all issues. I will be plugging in your suggestions though. Im just a guy...
I will not go into detail on how to setup passthrough for the quest 3 with virtual desktop. There already really good guides out there. This is my settings for best results. I have spent more time tweaking settings then I would like to admit but I believe I nailed it. If you have some settings...