Headlight restoration issues

Hi all,hope everyones safe and well at this tough time.

I have been taking the time to work on headlight restoration and most of the time has been a success.Sanding back my dads Peugeot headlight worked great as i use 800,1000,1500,2000 and 3000 grit wet and dry and once clouded i compound with Menzerna 300 or 400 on a wool pad then maybe up to 2500 on a blue pad and they came up nicely.Then clear coat and good to go.

However today myself and nephew decided to have a crack at my Focus Mk2.5 . One thing i noticed straight off that what i thought was lacquer peel was actually on the inside in some areas not outside.But the main thing i found is that even using 600 grit wet and dry on a dril the headlight lacquer is bullet proof !!!!! Worked on it for 3 hours with 800 grit and some areas didnt scratch up at all.Id never go below 600 grit but anyone got any ideas apart from buying new ones!haha . They look better than they did so thats good but they arent perfect and thats dribing my OCD nuts haha.

Thanks all , will try t take pics later.