My guitar thrives on Dmaj7 chords but if I tune it right it hates C major. Maybe it needs a bridge transplant???

BTW, a friend showed me a Dmaj7 lick (very easy!) that sounds merely OK on a 6-string but is luscious on a 12. Fretting just the top 3 strings:
Dmaj7, Gmin/D, F#min/D, Gmin/D...