it seems to be the pump. Rotary pumps need often to be replaced when standing long time without work. 60ml on 10sec. is normal with mainwaterline pressure and small injektor (or nozzle). u can install a manual pre-infusion switch to close the solenoid valve of the group and infuse with reduced mainwater pressure~2Bar for better taste. After for example 5-10sec. you start normal pull and turn the switch of.