The game's mostly about accuracy and speed, but what I would usually do is try and line up several up the orbs, so that I could collect several at a time.
I also found it useful to claw-shot up to the top, then work my way down; using that technique I could collect many orbs in a short amount of time.
Mostly just practice become more accurate at faster speeds.
I didn't actually realize there was patterns, but when I completed it both times, I just kept moving. I didn't bother to try and see where bigger lines of orbs were. I just grappled, got some orbs, reached the opposite fence, and grappled off towards more orbs. I think I only had to redo the second try once with this method. Maybe some of the patterned ways are better, but I found that stopping moving to get the best amount really used up my time. Good luck!