Cuprajake Me, I’ve never been one to flap about retention, you can loose 0.2 or more to a tamper
Sure, if I want to avoid the chaff I overdose by 0.5g or so and discard what I don’t want. Unless I have a small bag of expensive coffee & want to minimise waste.
Even without knocking/RDT, my Ode is only +/-1g or so.
But I’m struggling to see how a tamper can cling to as much as 0.2g of coffee.