Dr Guitar, i humbly seek your sage counsel regarding the replacement of the "nut" on my Martin DB7 GPZ750.

Which variety of "nut" do you favour? so far i have tried peanut, hazlenut and macadamia, i found that the "salted" variety give a more
"tasty" kind of sound - buy leave an oily residue on the fretboard.
I am at present experimenting with "coconut" but am experiencing major problems in being able to finger chords, not to mention i have immense problems trying to close the guitar case!
Your thoughts please.

Ulysses.