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My suggestion would be to use slimmer psu cable extender that does not protrude as far as current one(similar to one found in dan a4). Move psu closer to front io ports. Add ability to flip psu mounting so it could take air from the same side as GPU (will require adding holes in the case). 2 psu mounting options will allow to avoid possible conflicts with front io ports. That will increase space between psu and gpu - useful for cable management, may be even enough to fit 2.5 drives there. Same as others - I think that removing air pocket behind gpu, increasing riser length, and moving gpu closer to an opposite side panel- is generaly a good idea that will increase gpu compatibility list