back throw, j.mp (1 hit), ultra does 464 damage on ryu
back throw, ultra does 518 damage on ryu
so yea, never do it. ultra was scaled to 80% after the j.mp
j.mk, st.fp xx ex palm xx fadc, dash, dash ultra does 614 damage
j.mk, st.fp xx ex palm, ultra (in the corner) does 614 damage
j.mk, st.fp xx ex palm, ex fb, ultra (in the corner) does 656
j.mk, st.fp xx ex palm, hp fb, ultra (in the corner) does 607
j.mk, st.fp xx ex palm, dash, hurricane does 433
j.mk, st.fp xx ex palm, mp palm does 394
j.mk, st.fp xx ex palm, fp palm does 401
back throw, j.mp (1 hit), ex hurricane does 250
back throw, ex hurricane does 200
back throw, hurricane does 185
so imo, not worth it for the ex.
counter xx fadc, ultra in the corner does 594.
counter xx fadc, hurricane does 365
for reference, his jab does 30 damage.