The coffee place has no idea of your setup & should not tell people to always use 3. Beans vary by batch, by type, by location, by roast and by age. It is common even with the best of grinders to need to alter the setting for a perfect grind, even for the same beans used a week or so apart.
You can improve a particular pour by changing your tamp pressure, or the dose, or both, but of course you don't know how the pour is going to work until you do it so that only helps if you're doing more than one coffee or prepared to scrap the poor pour ( ) and do it again.
On top of all that the EM0480 is not the best of grinders on the market - most here would think it is the absolute minimum level grinder to use. You can find all kinds of issues with it - apparently Sunbeam has been shipping them out with a range of shims to make the bottom burrs get to the right place to make a decent grind - smacks of poor Quality checking and a later adjustment - maybe of the returns they are getting from people who have wound down their grinds to No.1 and still not got decent espresso grinds.
CoffeeSnobs to the rescue... I have a thread about my initial woes when I got my grinder so you might want to look at that, http://coffeesnobs.com.au/brewing-eq...w-machine.html but far better than my basic level of exploration is the thread by Ray_C, http://coffeesnobs.com.au/grinders/2...lems-good.html Reading Ray's guide it seems the EM0480 can be an excellent grinder, but you need to perform some of the things Sunbeam SHOULD have done before selling them.