Welcome to CS. You will get answers to problems from many Silva owners here.
I had one before getting a VBM so am a bit rusty with regard to Miss Silvia.
People will want to know the roast date of your beans and also the type of grinder you are using?
This is a serious machine and doesnt rely on a pressurised basket like some Sunbeams (but the sunbeam owners will tell you in more detail).
Bottom line is the Silvia is capable of exceptional coffee using fresh roasted coffee and ground on a good quality grinder.
I had it paired with a Macap M4 (grinder cost as much at the Silvia at the time)
It took me several weeks to pull some remarkable shots, and most of the help I got was right here on CS.
Good luck and stick with it.