The problem with 16 is that you need to do 1 extra sequence of 4 plants in the end with slows done eveyrhting by 25%.
16+16+16+16+16+16+4 = 7 sequences
17+17+17+17+17+15 = 6 sequences
The reaction time is based on your PC.. the script is set to react/reload every 50ms
So it reloads all objects, plants,... every 50 ms if you PC can keep up atleast
You can actually do 20 plants on a good computer, maybe 1-2 dies due to some lag once in a while, that's what I always do
Run it once on stealth and then you can see how it's supposed to run.
So go try to run it a few sequences on stealth mode and you will see how your PC slows it down.
You can try to restart mirror, sometimes that fixes it.
Also make sure you only run 1 bot in each client, don't run 2 bots in 1 client, split them up in 2 clients