Stable water levels are more important than trying to chase the perfect levels, unless you have a fish that has specific needs. Most fish can adjust and acclimate to the ph in your tank. This is important if the ph of the water you are adding is different than your tank. You don’t want to balance to a lower ph, do a water change and have ph rise, then add stuff to bring it back down. The fluctuations will be much harder on the fish than letting them adjust, also much less stressful for you.