Never have or had any issues with DP and the Cop is pure quality. Tasty as fuck, lovely looking dense nugs, piss easy to grow and excellent smoke.
I use 60/40 Tropic Mix, Ecothrive Charge Powder from sprouting seeds pots to potting on to final pots then 1ml per ltr Buddhas Tree Organicus and NOTHING else.
I have tried them all over the decades and very rarely feel the need to shout about a product but this does need a mention because it really is te best I've ever used. Consistency is key and here it is in all in one form where many have tried and failed but not with this.
As a side note, nutes are great but remember, twice as much is not always twice as good and trying to pack as many nutes in is not good at all.
Keep it simple and this stuff is exactly that but it works wonders for me.