that tank is too low on surface area to run a typical fishless cycle, your numbers are going to be way off even when it is cycled. are you going to add extra support filters to the setup or more surface area? if not, then don't go to 2 ppm ammonia like the directions say, go to 1/2-1 ppm max
you could remove the upcoming headache bigtime (assuming no more additions are coming, this is the surface area we're working with) if you would not test for anything at all and just use 30 days time as your cycling goal.
There are online calcs that tell you exactly how much ammonium chloride to add to make any volume of water 1/2-1 part per million, we don't need a tester that reads inaccurately too unhelp us (heh/api slant)
all you do is add your bottle bac, add the ammonium chloride estimate from those charts, and circulate the system two weeks. hit it again at that point
circulate two more weeks, a total of 4, and two doses of ammonia and bottle bac.
at the end of 30 days, do a full water change, you are as cycled as possible for that amnt of surface area.
no test cycling is amazing and cannot fail, cycles don't vary. surface area and boosts do, and we just accounted for all that. its ok to test too, all 3, but simple searches show the API madness therein, and that's on tank with normal surface area in tow. That's a special confound for your cycle to consider.
We do not need testing to cycle any aquarium at any time, they all follow the same path which is why online cycling charts don't vary much other than a handful of days. After your full water change, the system will be able to digest 1/2 ppm in 24 hours, but only if you are using salifert ammonia.
api will give ya the permanent .25 we can see from searches. 2 ppm ammonia is too high for that setup to use as the final digestion proof test. time to ditch the directions and do microbiology instead