I have a Delta Monitor Multichoice 13/14. Removed the hex screw but handle will still not come off. I tried all kinds of twisting and banging on it. Some people suggested rotating the handle past 180 degrees which i tried with some light force but do not want to break the assembly at the same time. Is there something I'm missing or are the pieces most likely corroded together? I'm assuming they were not glued together.
Confirming from the fine manual it appears you're on the right track-- remove the set screw then pull.
You may be able to use a faucet puller tool for slightly more leverage.
If there is a buildup of mineral deposit or corrosion you may need to use a chemical to loosen the threads.