New machine - help needed

So, I got my new Gaggia Evolution, and very soon testing began. 1/2
pound of beans and 30 minutes after opening, i've reached what I
believe is the right combination of coffee amount / grind thickness/
tamp pressure and i've reached ~2 ounces @ 24 sec using a double
basket.

The problem is in the way the coffee comes out: At the very beginning
it looks fine, but after very few seconds, the stream turns blond, and
in a way I can describe as wider but slower stream with waves.
The crema seems a bit pale also, and the taste also implies that
something isn't right, its a pretty dark roast and the coffee is way
too acidic and bitter.

The "Equipment": Gaggia Evolution
Nemox Lux grinder
~ 14 days old beans, the same mixture
I've used daily with my brikka

.

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