If you can't find a Galka to test rapture DS cure 4 on, go into aby, get no atmas and only the cruor HP buff and try it on yourself. Obviously you can't zone to lose your HP though so you'll have to let stuff whack you.

Currently BLU is the only other job coming close to WHM for curing, though 95% of all BLUs would probably rather not join a pt, than join to be a main heal. Their new white wind spell is going to be very good as a replacement for curaga 3~4