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These things can affect grind buyoancy:
Roast level--lighter tends to be more buoyant due to greater retention of gasses during roasting
Roast freshness--fresher roasts retain more gasses due to less time spent off gassing; this effect is compounded by roast level
Grind freshness--fresher grinds retain more gasses due to less time spent off gassing
Grind ...
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It is perfectly normal for the grounds to fall to the bottom relatively soon, even before pressing. In fact, you don't even need to press, you can just use the plunger as a strainer when you're done brewing. If your coffee tastes too sour, it is most probably underextracted. A weak ("light") body also hints at underextraction. To increase ...
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