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If it was me the next thing I might try was to start over to eliminate the possibility that you accidently did something that is causing the problem. Without actually logging into each device I could not begin to guess what that might be.
I don't know if you can do this, but I would set each Sonicwall back to its factory defaults. If you want you can first save each of the configs by exporting them, so you could go back. Then configure the LAN and WAN X interface and nothing else. Then using only the wizard on each device, I would configure the STS vpn and see what happens.