I have fished A LOT using gulp sandworms (natural, camo, newpenny). I have never even come close to catching a whiting. Throw a real sandworm on a hook and they are all over. I rate Gulp Sandworms highly for everything from bream, flounder and even monster flathead. Whiting seem too clever. I've never seen a Gulp Sandworm in Nuclear chicken so can't rate them.
Edit: Just saw you said bloodworm. Never tried them. Ignore everything above.
Adrian36cm Redfin, 58cm Golden Perch, 35cm Whiting, 38cm Tailor, 42cm Sand Flathead, 62cm Dusky Flathead, 32cm Snapper, 47cm Black Bream, 68cm Salmon, 30cm Flounder, 42cm Frigate Mackerel