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hippy-
Pretty much. The boiler is 350ml but I think only half fills with water so there is room for steam.
As such 30 ml of water in a shot is approx 1/5 of the water in the boiler.
I had the PID on a Silvia and you could see the temp drop by approx 15C with each shot. All the PID does is help ensure the boiler doesn't overshoot and get too hot as it comes back up to temp.
dancing james
Don't bother with a PID on Silvia
The boiler is so small that each shot causes the boiler to refill with water. So the temperature will never be stable.