A few things to mention... a bit of water dripping after an extraction would likely be caused by a clogged 3-way solenoid. It serves a purpose of diverting pressure into the drip tray after an extraction as well as keeping 'a closed circuit' on boiler pressure when sitting ON/idle and if not...
Salt clearly offers tons of benefits, but damn sure will never make it into my espresso. If anything needs to be added to coffee to make it more enjoyable/palatable then figure out what you're doing that could clearly be improved. Why people continue to push garbage links is a bit much these...