Thanks for all the information guys, gonna give the pruning a go and see if it helps
Didn't know that about mancozeb either, will be more careful around it in the future
And on the topic of chemical treatment on plants, i recently discovered that the strawberries i grow at home will go bad even after 2 days in the fridge while the store bought ones last for a week at least. Makes me worry about what they're sprayed with