I've spent the last couple of weeks dialing in the DSC on my RS3, and I've definitely got some thoughts on your points.
I agree that the car needs to be pretty stiff to avoid that floating feeling. I found that a range of 800-1100mA on the shock calibration table, combined with APR's comfort velocity map and a custom G-force table (starting at 20% 0g center), gave me a great balance for spirited driving and daily comfort. I added a mild speed map, and my G-comfort setting is at 15%. With this setup, I start with default mA values around 900 which feels right driving this car mildly, but the velocity map can soften back to 800 to handle bumps while the g-force and speed maps gradually dial up stiffness as driving intensity increases. Even on my twisty test road with sharp bumps, soft undulations and elevation changes, I haven't experienced any floating and gained confidence, even started to smile! I disabled all other tables so I could iterate and see changes quickly.
I don't think we can fully eliminate the pogo effect on this platform, though I have been able to dampen it. My guess is that the limited negative travel on these shocks is the culprit.
Interestingly, my road settings didn't translate well to the track. The velocity settings made the car too soft on berms and bumps at high speeds. I had to remove them, reduce the shock calibration range to 900-1100mA, and create a more aggressive speed table for the track.
Generally, I'd guess the stock controller is set up incredibly stiff from the factory.
I also have to remember that since I've got 034's lowering springs, rear sway bar, camber plates, and other goodies, they set a good default and to some degree negate the need for excessive tuning of the DSC. The current configuration certainly adds to the hardware improvements, especially in tight high g corners.
Regarding your suspension errors, I'd start by checking the pins on the controller. They can easily get bent out of place.
Overall, I'm happy with the DSC controller, but it definitely takes time to fine-tune and I'm still working on it. Don't give up!
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