Have you tried Cees Beers' home-made cork pads. He sent me a set after I bought my Adas but I never put them on. The flat section was a bit too broad, much taller than the braking track.
The ADA's are stupid-light. My previous climbing wheels are Ambrosio X-Carbos built-up on an FRM Front and Record rear hubset with Sapim CX-Rays, fairly light. The ADA's are spooky - they are so much lighter. If someone describe how much lighter they actually feel, I would not have believed it. I have heard all the stories about Cees and his wheels from people on this forum. I have to say that I found him very helpful. I think some people get put-off by his terse correspondence, but I think that is just his manner. He comes across much better on the telephone. If people are considering ADA's, I would strongly recommend speaking to Cees on the telephone to get some perspective on the man.
With respect to the ADA pads, I think that I will try them this week. I am going for a 100-120km blast now and will put my Corima/Ambrosio pads on for now, as I have separate holders for them. The Corima/Ambrosio pads are a much harder compound than Cees' pads are. As you say, they are also much narrower.