your system needs its filtration handled in a way that differs from nearly every tank on the site
which makes for fun planning/adjusting the needs to the job at hand
you sound interested in the process that makes it fun to discuss.
the enduring rule that guides your setup is that within any use of bottle bac and a feed source and at worst 20 days wait, whatever surface area you have stewing in said mix has enough filter bacteria on it to 'go' and no testing is required, counting to day 20 is the measured item-but you have to place that media correctly and have enough of it in your particular setup.
we do the big water change at the end of the wait to export nutrients, that cause algae, as soon as you begin lighting the system. a clean start is always best after an extended wait in purposefully overfed waters (the cycle wait time). reefs are designed to clear 2ppm of ammonia fast, due to their surface area
I wouldn't use 2ppm in your setup, half that is plenty.
your test kit isn't going to help at all because you can't be sure of it's truth. if your testing methods and technique are perfect, there's many nuances required to interpret api correctly and know when it's flat wrong, AND you have a faultless test kit (Rare for api, do a search) then you might get a helpful guide for your cycle
but if you count 20 days, that's far beyond what cycle bacteria require to setup in any common arrangment and counting days takes the place of tedious testing and not knowing if your readout is correct because its API. your issue is that only the edges of your water table are filtered, what swirls around in the center not broken up by mass (rocks in the tank) isn't filtered as well. if you have rolling currents in the center, nobody knows, then wastewater tumbles and doesn't turnover as well.
I can see the sand surface area above and can envision the coral scape going in, the resin setup those look nice
let's see a picture of your filter setup
the simplest way to view your cycle is that 20 days of waiting for whatever is created as a biofilter means cycled, testing isn't what determines the completion. the timeframes to coat a given surface area in bac are already known and charted and if your system filtration is designed like other synthetic scape setups yours will perform the same/carry the same number of fish without requiring tedious testing to determine that ability.