Convertible flappy bit and leaks

For some months, the drophead kept the rain out. Then it started to leak and this ended up worse than my old MG Midget. After some research, I found Sonax GummiPflege (Rubber Care), cleaned and treated all the rubber seals. Great improvement. And the wind noise reduced (something reported by other convertible owners). The RH side is back to dry - however there is still a slight leak when windy/wet on the LH side which appears to be coming from one of the meeting points (arrowed). I have re-treated the rubber in that area and await the next downpour.

When driving, there is still more wind noise from the left than the right (which sounds as normal as any Z). It's always been like that even before the leak started. I noticed that, on both sides, there is a bit of fabric which only appears to be attached at each end - arrowed. Is this correct? Is it just to protect the hood material from friction wear when closing the hood or should it be doing something else / fixed in some way?

Any advice from other Z convertible owners? Thanks.