Wet pucks can be caused by several things: too fine a grind, too cool temperatures, overfilled baskets, too hard a tamp... I've heard that pucks on the older Silvias could sometimes be a little damp.
Try to keep some of your technique const. For instance, use a 30# tamp always, regardless of how fine or coarse you grind. Is your coffee fresh? Stale coffee is not a great way to go, producing thin watery shots, and subsequent sloppy pucks. Is your machine the one that is PID'd?
If you're having to temp surf, make sure your machine has been warmed up at least 30 minutes, and you might want to flush the group a few times as well. Not owning your machine, not having first hand experience, other posters might be more helpful.
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