Do you keep your palm flat and fingers strait and tap the table or do you lift your palm up a bit and bend your fingers too?yeah just tap on tables, i annoy people at school like that
i also use an elastic band, fold it in half, finger in each loop and holding the middle with your other hand, its improved my speed considerably
also just sitting there while watching tv with your gun helps, (as you dont have it then tables and laccy bands are the next best thing IMO anyway) <- that bit applies to furious