Very lightly roasted coffee requires a low dose, a high water ratio, and some bypass water (as above). Using a small 5oz/150ml cup will taste better than being washed out in a large cup.
At the other end of the roast/density spectrum, a very dark roasted bean is very ashy and burnt-tasting. A large volume of milk helps make a more palatable drink. A larger 8oz/236ml cup will taste better.
Your coffee is likely to be roasted somewhere between these extremes.
Classic Range Flat White Cup (150ml) – Acme Cups New Zealand
Classic Range Tulip Cup (170ml) – Acme Cups New Zealand
Classic Range Cappuccino Cup (190ml) – Acme Cups New Zealand
Classic Range Latte Cup (280ml) – Acme Cups New Zealand
Changing your cup size to suit your roast level is recommended.