Did you find a solution to this? I'm in the same exact situation with that GPU and heard that it causes sagging. I found a bracket that has a PCI extender: https://www.amazon.com/Phanteks-PH-VGPUKT_02-Universal-Vertical-Pci/dp/B07MW73HTJ/ref=sr_1_18?dchild=1&keywords=GPU+BRACKET+FRACTAL+R5&qid=1613104277&s=electronics&sr=1-18

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wondering if it might work? The only answer I found was for the stock Gigabyte 3080 and not this version. Another person said that this specific bracket was not long enough and it can get in the way of slots.

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Anyone know what the best bracket might be for this monster of a GPU in a Fractal R5 Case?