I have had my TZ for about 2 and 1/2 months. Since then I have replaced the flipper coils (using the specs in the manual). At the time the flippers were good and I did not have a problem with airballs. Two weeks ago I did a full LED conversion of the game as well as swapped my rubbers to white and red for the flippers. I have had quite a bit of airballs when hitting the rubbers near the ramp or clock millions. If downgrading my flipper coils is the best way to go what would be a step down from the factory specs?