Wellity wellity wellity! Here we go! A bit of background if I may...I bought an F70 7yrs ago, sort of a 'sister' to your rig...it came with the 'stock' phones...I thought, "Hey, I'm finding all sorts of stuff with these cheap cans, so why go any further?"
WRONG! All the old guys tried to warn me, said, "Puppy, with that rig, you gotta go with some high quality audios"...But I didnt listen for a real long time and made due as I learned the subtleties of dirt metal tones thinking I knew what I was doing...I even ran Garret phones on the F70 for a few years since they were freebies with my AtPro...! What a freaking cheapskate I am/was!
So then I broke down and ordered up a set of quality cans....I now run a set of GG NDTS on this rig, and I can say, coming off of stock cans, combined with the power of a rig like you got, its just amazingly wonderful the nuances of sound you hear with some quality phones! So yeah, drop $120 or so on some quality cans and thank me later...this IS an audio based Sport afterall, and if you cant hear it, you cant find it!
Mud