Those blinds look great, i could have used some of those .Removed the Heko wind deflectors from the S4 as the fronts were starting to bulge out and not fit very well. I had to trim them down when i originally fitted them as they barely squeezed in length wise. I like the look of the wind deflectors on the Avant but not so much on the saloon. I have fitted a set of perfect fit blinds which fit spot on and give the tinted look to the rear windows but can removed at any time. I have had them in all my A4/S4's. I think the next mod will be a set of factory front and rear mud flaps, thats if they are still available through TPS.
I'm not a big fan of the wind deflectors' full stop but I can appreciate their use and why owners fit them.
I just open the rear window a shade to stop the vacuum from being created.
I'm surprised you don't have the electric rear window blind fitted, it was an option like most parts in Audi's but a lot of S4's did come from the factory with it.