What is the pH? I would suggest not messing with the pH unless you know what you are doing. <And you don't use those pH up / down stuff to alter pH; you need to alter the buffer system. Otherwise, you get yo-yo-ing pH, which is way worse than an "off" pH.>
It is normal to have the pH drop a bit during cycling. <Conversion of ammonia to nitrate releases acids.> You fix that with water changes.
How much water changes are you doing? With ammonia at 4, you need to do something like a 90% pwc
to get it down to 0.5 (max I would have for a fishy cycling.) Doing 5-10% changes won't alter things much.
One other thing to test - check the ammonia in tap water that have dechlor & ammo-lock added. (ie your change water before you add it to the tank.) Sometimes, the dechlor messes with the test result, or you might have high chloramines in the tap water.
And can you post all your test numbers? esp, the NO2