Not totally familiar with the wheel hop issues on Golf 7 GTD, but on all previous Golf chassis types it is closely related to gearbox and engine mounts – because they allow some movement to absorb vibrations etc, the standard mounts reverberate under duress, eg excessive drivetrain torque reaction. The trick to ameliorate wheel hop / tramp on the Mk 4 Golf was always to fit the uprated "dogbone" mount, also on the Mk 5/6 chassis to fit the poly inserts into the voids of the standard bottom mount. I presume that there are, by now, uprated gearbox and engine mounts available for the Mk 7 too... eg Volkswagen Racing
Maybe thats why I can't seem to find anyone offering one!