Just use the adjustable rope hangers without the wire ones. 1 each corner. Use 1 if dont have enough on each end and only 1 wire. Connect in middle. Will give 8 inches.
Additionally, you can move the ceiling attachments so that the adjustable hangers are vertical, with four attachments, rather than angled in to a single attachment point. That will gain you another few inches if needed.
@dmykins , I ran into the same problem last grow. I fabricated a hanger from a couple pieces of aluminum flat stock that replaced the wire coupling that the adjusters attached to. Kinda hard to explain but I’ll post a picture shortly. Far sturdier and gained a several inches.n
I like it! I am going to see what I can rig up ahead of my next grow. I am going to take some inspiration from your design. I have a 3D printer, I wonder if I can fabricate something.
@Isleofdogs
I converted a corner of my basement into a space. I could probably rework my lights and attach higher in the ceiling, I would just have to wait until this grow is over.