1lbs and 8 oz is equal to six small potatoes or 4 large potatoes
Try out varieties of potatoes like Crimson King for the best color, or use your favorite blue/purple potatoes!
Instead of flax seed powder try using ground chia seed powder. Both of theses seed powders create a gelling and binding effect for the gnocchi.
To make this gluten free try using potato starch instead of flour. The result will be slightly more chewy and it will be more soft after coming out of the water, if you let it cool the gnocchi will firm up.