This is my first clonal cultivation.

So, you have a salt build up from too much nutrition and not enough run off. Which has the ph out of line causing lock out. Which is showing in different signs the plant has. The dark green in center of leaves is also the key indication of my diagnosis. As I have experienced this first hand when I started growing years ago.

le foglie accorciate io le tolgo appena spuntano i nuovi germogli perche diventano inutili , hanno supportato la pianta durante la formazione delle radici il resto sta a te del radicante per aumentare la radificazione micorizze per l'assorbimento delle sostanze nutritive e un npk non troppo forte

Keep misting the leaves until you get roots and new growth a of the existing leaves might die off as it generates new growth like 10 days you should be getting new roots and new groth should start too