I don't know if this will completely solve your shifter issue, but I think - considering the bike is too big with drops - it will lessen it considerably.
You may not have to part with the bike just yet, using some geometry and stuff and you see how you may be able to find a fit you want. The actual reach from the charts to me is not hugely different from JA to Atlantis. The reach is from the center bb line to the middle top heat tube. Some the additional tt length of the JA is because of the 71.5d sta vs. 72d on the Atlantis. Since your saddle is not all the way back the actual reach is less than just tt measurement may imply.
I understand your frustration and dont mean on keep hitting a dead horse but for whatever its worth, in case you are not familiar with it, the 20th edition Riv Bicycle catalogue includes an overlay of the different bars common to these bikes. It helped me deciphering the bar choices I had. The catalogue and the overlay pics are readily available through Google search. I cant post pics from my iPad but I could from my desktop if you dont find them. Let me know.
Best of luck, whichever way this turns out to go.
Pano
That's why as much as I can get drawn to various new Riv models none of them have been exactly what I want so there's no use getting one no matter what. So yeah, you'll get your Atlantis and whatever happened before will not matter, like water under the bridge and it all ends up in the sea.
Thats a killer deal
Also, if this were my size I've had bought it ages ago. Just sayin.
Still for sale?