Need help with my espresso! - eviltoast

Hello Guys 1st Issue I have a GCP with a Eureka Mignon Crono which has a 50mm burrs. The coffee tastes good, but I never reached 25-30 seconds of extraction, the closest is 18 seconds.
I add 9g of beans into my grinder and I get 25-30g in my cup, I always use the single basket.
Can you direct me with troubleshooting steps ?

2nd Issue My final goal is to make cortado, I tried couple times after reading guides and watching videos to steam milk, but I can’t steam like they do.
I use 3% milk, Any tips?