New to the world of espresso! Firmly down the rabbit hole

Any advice for dialling in on the Eureka Oro from fellow owners? Kinda winging it at the moment.

Started +2.0 from true zero and slowly working my way up to about a +4.0 at the moment, still shots are feeling a bit choked so just wondering what others experience is.

Shots taste great though but that's probably just my unrefined palate. ​