Found bud rot this morning. Last week was solid r...

Seems to be a lot of outdoor growers living in areas that are getting cooler temperatures having the same issue showing up. Moisture ,cooler temps longer nights are a perfect environment for fungus and mold,mildew. The rain and morning dew sitting on the plants isn't helping matters either. You are definately doing the right thing by removing the infected buds. I would cut a few inches below where it seems healthy. I would sterilize the clippers between cut in a solution of 1 part bleach and 9 parts water. Then rinse in clean water. May be easier to use two clippers soaking one while using the other. I would do this only when dealing with removing contaminated plant parts. Next I would perform a modest defoliation of the larger fan leaves to open her up for better air circulation and so more sun light will reach her. Don't strip completely. There has been some success in using Bacillus Subtilis to combat Botrytis cinerea and other fungal/bacteria rot in plants. https://www3.epa.gov/pesticides/chem_search/reg_actions/registration/decision_PC-006479_9-Aug-06.pdf#targetText=Bacillus%20subtilis%20strain%20QST%20713,bacterial%20spot%2C%20and%20walnut%20blight.