My tip is to go to a japanese grocery store and buy an onigiri mold for $3. All you do is stuff the rice (and fillings) into the mold and press. Keep the mold in a bowl of water between making balls (like they keep ice cream scoops in water)
You can also buy specific Japanese rice varieties that are better textured when cold. You can also figure out how to store them without the nori touching the rice
My tip is to go to a japanese grocery store and buy an onigiri mold for $3. All you do is stuff the rice (and fillings) into the mold and press. Keep the mold in a bowl of water between making balls (like they keep ice cream scoops in water)