I'm guessing that cutting the offending trees down isn't an option...?
My main concern, tho minor, would be mother nature. Weather events like the Santa Ana winds can play havoc on shadecloth or visquen.
Also, have you ever ph'd your local rain water? Just curious...heard it tends to be a tad acidic now-a-days. If growing in pots with peat based mixes, it will likely lower ph even more.

Looking forward to the pix. :thumbsup: