Dear Rebel,
First and foremost, as a 1-year-old model your 4120 must still be under warrantee, E95 isn't approved by JD for your tractor, so case closed for the short term.
Long term, you're looking at injector changes, electronic changes, compression changes and then some more injector cleaning/changes. My advice: Google E95 and read up on how its been used. Nice thought in a lot of ways, but currently impractical.