Congrats on a great purchase.
I experienced the puddle of water from time to time. *It doesnt do it now. *I think it had a lot to do with the level and fineness of the grind and the pressure of the tamping. (IMO A three way valve will not suck anything out - It releases pressure. If it did suck would really choke the valve with grinds.)
You dont say what grinder you are using - it is part of the equation as is the timing of *the shot.
I agree they are a fabulous looking machine and I am very happy with mine which also replaced a Silvia.
If you are getting good shots I dont think the water bit is anything to worry about