There's no such thing as too many water changes as long as you are dechlorinating the water and temperature matching it. I recommend using Seachem Prime because it also temporarily neutralizes ammonia and nitrIte for 24-36 hours to buy your fish some time between water changes.
Let your test kit dictate the size and frequency of water changes...not a clock. With a heavy bio-load like you have, sometimes more than one water change per day is needed. I recommend trying to keep your ammonia and no2
level at or below .25 at all times until the tank is cycled.