I know that polishing your picks makes them looks nice, but ultimately it doesn't help your picking skills, and if done too severely - as appears to be the case here - it can seriously weaken your picks. I'd certainly advise that great care be taken when polishing slimline picks.
In the military, we used to work on ways of blackening picks to completely prevent reflection, trying to find methods that were not detrimental to the effectiveness of the tools.
Take care of your picks. Don't worry too much about how they look; How well they pick is far more important.
Hope I helped,
Jack
