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That's why I said "even louder" (still a bad way to express it, my bad). It's not quite "louder". I feel that it's "louder" and something more.

Yeah, you are right, louder and "a bit" sounds...

As far as I can remember, it's used to express "even ...":
громко = loud
громче = louder
погромче = a tad/bit louder

Natives know better for sure. But that's how I understand it on the first...