Okay. I found your other thread so I kinda got the bigger picture now and yes, there were a couple of mistakes in the beginning so you are basically starting with a new tank even tho it's with 5 week old cycled gravel.
There are a couple of things you can do which are a little extreme but very effective. 1 is to remove the fish from the tank into a temporary tank or container and just let the cycle happen itself. No water changes or feeding or anything. Just let the tank go it's natural way. You already have the ammonia of your entire stock in the tank so once the ammonia & nitrite levels return to 0, the tank will be cycled for that amount of load and so you can return your fish to the tank. In the "spare" tank, you will be doing more regular water changes so that the ammonia level does not climb at all keeping the water safe for the fish. That's one way.
Another is to get some live bacteria in a bottle ( People here seem to like Dr. Tim's but I have no first hand knowledge of it's efficiency) and start adding that as per the directions and this should speed up the cycling process so you can leave the fish in the tank. If you can get some more filter material from a cycled aquarium, it will do this same thing.
Another way is to keep going as you are going paying close attention to the PH and nitrite levels. As I said, a lower pH will convert the ammonia into ammonium which is much safer for the fish even at higher levels than ammonia is. Once the nitrites start to rise, you should start doing more regular water changes ( ie, every other day) and use PRIME as directed to detoxify the nitrites that remain after the water change. It will take a little while but the ammonia will go back down and the nitrites also will eventually go down to where you can go back to a regular weekly water change without having your levels change so abruptly.
The biggest thing to look for is to not let your PH rise if you have high ammonia in the tank with the fish still in it. It instantly is converted back to toxic ammonia once the PH rises too high and that can kill the fish.
Hope this helps.