Candy, I had a similar (but slightly smaller) problem with feather (not sawtooth) caulerpa. Here's what I did, it may help you out. Take the rocks outta the tank one at a time and put them in a bucket of salt water. Pull what you can off them carefully paying particular attention to the points of attachment- that stuff seems to drill into the LR! Scrub the rock carefully with a stiff scrubbing brush- this does little to remove the caulerpa, but you might as well remove any debris and detritus buildup while you are at it. Replace each rock when you are finished in the tank and start on a new one. If you have a refugium, put some caulerpa in there (Check with the smarter folks here as to whether that species is suitable, I use the grape type). Get your PO4 and NO levels right down, up your photo period over the 'fuge and let the fuge caulerpa compete for any nutrients with any residual in your - now hopefully caulerpa free- display.
There really seem to be no short cuts to fighting it, Foxfaces have differing success levels, IME tangs wont touch it... roll up your sleeves...