Please, do not be stressed. You have no fish in the tank, so nothing will be harmed if you make a mistake. There are a number of things any successful fish keeper must learn over time. Perhaps the most difficult of these is patience. There is a lot of noise out there re cycling and this can make it difficult to sort out the facts v.s. the fictions. I always tell folks starting out and doing a cycle that they should choose just one voice to which they will listen.
If you have chosen the wrong voice, you will likely fail and you will learn from your mistakes. If you choose a "right" voice, you will succeed and you will learn from your success. In your life it will not make a big difference if you manage to cycle your tank in a week, a month or several months. You are not unique in dealing with this. My first tank was a mess when it came to cycling.
Sorry, I am an awful typist. Yes NH3 and NH4. In acid waters one can have Total Ammonia and 0 of it be in the form of NH3. However, in a tank, it is not possible to have all NH3 and no NH4. Another way to come at this is from the removal of TA side things. Basically, all of the Total Ammonia can be removed from a given system in one of three ways.
If only NH3 is removed by bacteria, as it is, the NH4 still there will immediately convert some into NH3 based on the pH and temperature. And then the bacteria will use that NH3 and the process repeats until TA is no longer detectable on our kits. On the other hand, plants prefer NH4. And if only NH4 is removed from a given system the NH3 that remains will partially convert to NH4. So all of the TA can be removed but only taking out the NH4. Of course, if both bacteria and plants are present, then the TA is being removed by both HN3 and NH4 being consumed.
Hang in there. The ammonia should continue to drop and so should the nitrite. Test again tonight. When a fishless cycle goes wonky from the wrong amount of ammonia and/or nitrite, it can take a little time to get back on track. When you see ammonia close to or under .25 ppm and nitrite is also clearly below 1 ppm, do the next full addition of ammonia. You are really close to being at that point from your above post. Once you do Dose #4, simply continue to follow the directions in my article.
One last thing about cycling. As it progresses things accellerate. Look at the graph in my article and see how each spike is lower than the previous one and also lasts a shorter amount of time.