If possible, it's always better to use an actual 5128 measurement for EQ, all of the "Δ" (Delta) versions of JM-1 on 711 are helpful when a 5128 measurement is unavailable, but a static compensation from the 5128 to 711 can only help so much.
FWIW, I think a 10dB tilt is too much tilt, I've...