dont go espresso fine. moka requires filter-range grind. your exact grind and prep can have a real impact on your brew so doing some experimenting with grind size may be rewarding. you may be able to grind finer (within the filter range) for moka. the main issue is that moka naturally carries fines up to the collection chamber, so i recommend starting with a medium filter grind to keep the brew quick and free-flowing. it can also help immensely to sandwich an aeropress filter above the basket to reduce the fines.