Hello,
if you're Litronics are not self adjusting, they don't work correctly. So hahaha - funny you wonder why your headlights are bad.
I've replaced all bulbs and the D2S in my stock OEM Litronics lately. And yes, that makes a difference. I did use good quality bulbs from Osram. But nothing fancy.
Don't compare modern LED OEM headlamp systems like 2017 Audis and Mercedes have with a 15 year old Porsche Litronic. The new ones are better. But i don't like them, because they tend to glare me when other cars have them and i drive at night.
Regards, Markus