Wow? How about the situation of putting the opponent in the corner from mid stage in one combo? I'd rather be doing johnnys corner rape combos ending with nut punchs rather then doing a nut punch after 4, 4, (since it tends to miss most of the time anyway) and following up with safe strings. Nut punch is more reliable when used with a b3, dash, 2, 1, 4, 4, nutpunch sorta deal or f3, 2, nutpunch/f3, 3, b3, nut punch.
jps, 2, 1, f2, dash 4, 4, shadow/flip is the way to go if the opponent is not in the corner. Alternating 2, 1, b4, and 2, 1, f2, 2, 2, 2, 2, 2, 4, 4, nut punch after getting your opponent in the corner with the first combo is a much better way of utilizing johnnys specials and pressure imo.