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I use a different method to wp for mocha pots. It's largely James Hoffman's way of doing it.
Use fresh espresso beans. Boil the kettle to about 90% and then turn off. Put the hot water in the pot and then the coffee. Put on the hob on a very low heat with the lid open. This make the extraction slow to avoid any bitterness. The crema should be dark brown when it bubbles through. As soon as it starts to get lighter then the extraction is getting too quick and you need to stop it. Take the pot off the hob and rinse the base with cold water and you're good to go!
I get virtually nothing but good cups from mine, though my technique and bean choice may make some people cringe.
Should add that a good maker is critical, I'm very happy (and have given away all the Bialettis) with Top Moka.