Each plant is an individual.
Perlite also doesn't hold moisture.
I myself use a cheap Lowes Moisture Meter $12-$15 dollars.
Ive been growing 45 years, and still use the meter. Takes 100% of the guesswork out if it. I also lift the container, and can tell if its heavy/light. But the Meter still takes all the guessing out of it. I usually do both, and have learned to tell how the heaviness of the container jives with the Meter. Thus making my guessing skill better.
But I just don't like to guess, and the Meter eliminates guessing. I also take readings from several areas of the pot, and in the lower part of the container if it has drainage holes. ( If not, I'll make some ) I stick the probe through the holes, and also measure deep into the pot/container. I also bury the probe to the hilt from the top.
I never let the needle get to the low moist line. Always a hair above, when measuring from above.
It also could be overwatered??