I have a Gaggia Classic and am generally happy with my pulls. 18g of grinds pulls in 20ish seconds give or take. I have a tamper with a spring and feel I'm fairly consistent overall. Baratza Encore burr grinder.
One thing I've noticed recently is that the puck is pretty damp after and occasionally sticks to the group screen instead of coming off in the portafilter.
Does this indicate any particular issue I should be aware of?