your garden looks great.
Inside the bush, there’s all sorts of foliage and small branches that restrict airflow. Not only is a lot of that growth unproductive, but When the rains come, mold can develop in the humid canopy.
Many people (myself included) spend a lot of time training and pruning the bushes to develop an open interior structure.
I’ll see if I have a photo to illustrate.
Also, scrog. Or trellis. I see a bit of netting, but you may be surprised how much all those branches weight when they get wet.
Anyway, good luck. Nice looking trees.