If the problem is direct contact with your tailbone then a saddle with a posterior cut out may help. The Rido might accomplish that but I'm basing that statement on looking at images of the saddle only, I have no direct experience with it.
The other factor in tail bone pain is that you can have stress on the ligaments that attach to the tailbone if your saddle is too narrow, or too dome shaped from side to side. It may be helpful if you explored which (or perhaps both) of these scenarios are the problem.
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2007 Look Dura Ace
2010 Custom Tonic cross with discs, SRAM
2012 Moots YBB 2 x 10 Shimano XTR
2014 Soma B-Side SS