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i think im overfeeding a bit but im using only the ot1s guide
I honestly don't think this is causing your problem but just wanted to say - OT1's guide is just that, a guide. People talk about it as if you should follow it to the letter, and it's not the case, it's just a guideline... you need to watch your plants and learn what they need, not just follow a chart!
How are you smoking your joints? What kind of papers are you using? What kind of tobacco?
Try pure cannabis with RAW papers and see if you get any black smoke then!!

Also, how long are you drying for? Are you waiting until the stems snap cleanly?