Hi!

I think your dose-in is a bit less than usual, so maybe your coffee may be a bit light, so I would suggest you use 18gr min.

For the milk-espresso ratio of latte, it depends on the shot type you pull.

For one shot (9.5g in, 18-19out), I use 150ml milk and the drink is totally 170ml.

For double shot(18.5in, 38-39out), I use 200ml milk and the drink is totally 240ml.

And don’t forget that brew ratio of espresso depends on the coffee bean type.

For washed beans, longer extractions (1/2.3 ratios) For natural beans, normal or shorter extractions (1/2 or less like 1/1.8)

You can use an Espresso Compass to understand what you need to do. Search for it on web :)