Michael,
I used cold ro water. Pour into a cup, suck it up into the baster. and wash the coral with it, aiming for where you see bite marks, or loss of coral colour etc.
I think the osmolality shift isn't tolerated by the aefw. It seems to do nothing to the corals. My fish used to swim round the baster, so they knew a treat was coming.
Anthias love aefw!!, so do clowns and so do wrasses- they get eaten from the water column.
I think the flatworm stop is useful in nutrient starved corals. I am fairly sure it has an acute nutrient source for corals, so it just helps them to fight off the aefw.
If you already have a decent phos level, your corals will already have thicker skin and I'm not convinced that flatworm stop will add anything else.
If your corals look healthy, I wouldn't disturb them.
If aefw are taking over, try the ro basting.... it will clean a lot of them off and allow your coral to recover somewhat.
Mo