Slow growth??

They are different than auto slower at first as grow happend to me as normal i grow autos.but after 20 days or so they are fun you can do lot than autos with them. And in coco and perlite need calmag and roots nutrients every time. And next time for feminized plant start with small.pots i change pot 3 times before final pot

> 150w LED 80cm above running 70% With a setting like that, you must be well below 400μmol/m².s, which is not enough to trigger photosynthesis and can even stunt the plants. Lower the fixture and adjust the settings with the help of the PPFD sensor apk.

Not too slow have you got co2 bag???some plant grow slow till day 20 then accelerate and grow much faster look at my diary my strawberry banana day 16 smaller than yours that was my opinion

Down the LED to 70cm or even 60cm to see if it makes a difference

what is soil