you will need more practice with the Silvia, less with the 2 K set up
but 1 LB is about right if you get a really good grinder like the K3
it took me an lb to get that one dialed in 'just right'
Id been making espresso 4 - 5 years w the Silvia, and w/o a bottomless portafilter
a continuous variable grinder is much preferred over the 'click-click' grinder
and a botomless portafilter will let you know exactly what's happening as you create your shot