It’s definitely got some Bud Rot or Botrytis going on in there.

I water with a spray bottle until it looks wet and then I water again when it looks dry and the cup gets lighter than it was after I watered it!

I like to do 2-4 tops per 1-2 gallon pot depending on the cultivar I’m growing and I put as many pots as I can fit into my grow space!

Looks like the start of a calcium deficiency and maybe some magnesium deficiency starting? I feed my plants every watering but I’m not really familiar with the nutrients you’re using!