Welcome to CS.
I have people on staff that specialise in the JURA / auto side of the business so am not now necessarily up on the exact details of each model and in any case we do a great deal more in the commercial models rather than the domestics however........
a couple of rules of thumb: Factory default settings usually result in the worst possible coffee and the machines are not intended to be left on those settings......
In general wth autos, read the owner booklet.......then brew your coffee using a greater...rather than the minimal DOSE of grinds programmable per cup. Set the grind accordingly to give you a "good" (subject to individual opinion/taste) coffee. *BOTH of too coarse and too fine, are NO GOOD *so find a happy medium in grind for a given larger than std dose of grinds per cup. Use good quality beans only. DO NOT use oily beans as they will bog up the mechanism.
DO NOT try and set your grinder by timing the flow of brew to get a standard espresso (as you might when setting a Non Auto machine) eg 30 ml in 25 seconds or whatever according to which spec you read....this does not work for autos and they generally always flow quicker than that.
Bottom line, just set it so you get the nicest possible coffee.
very first CS site sponsor & Jura distributor ACT / SE NSW.