nut advice on a paesold bass

[Tomas Bouda]

here is my problem.
i have a 2003 paesold 593 bass (i am the original owner/player) and i have been really happy with the way it performs. however, i have always noticed that the d string actually touches the fingerboard about a half inch before the nut...which makes fingering across the strings a really weird exercise in ear training. but, seriously its about a half inch off. i want to know what my options are, and i look forward to what you guys (pros) know.
thanks a lot!
ps
it also came with a wittner composite tailpiece...but i think it sounds really wimpy. having a heavier wood, or even just wood would make it sound ballsier, wouldn't it?

thanks again!