I identify with the member who posted that it was difficult to comprehend Cutler while chelating! Many members report this. Some find it helpful to listen to his audio interviews, ie the one with Dr. Dan Pompa, Schauss, etc.
Your symptoms might be suggesting that you need more adrenal support. Don't take this lightly! There are a couple of files in the Files section of the frequent dose chelation group that people can use to try to get a feel for the state of their adrenals. Then they can get a 4x saliva cortisol test and other tests.
lowering to 30mg sounds reasonable and wise.
At some point you might try adding a tiny bit of DMSA again, maybe 12mg. Sometimes after a while people can tolerate a chelator that they did not tolerate in the beginning.