There must be a reason the 3.4.2 updater script refused to patch the libcurl and libsoup. There should not have been a problem if the 3.4 files were as expected. My kindle k3 had no errors when updating from 3.4 to 3.4.2 although I didn't check any logs. If the 3.4 libraries are not as expected then they could be found in the pastebin page in the 3.4 rootfs.img
http://pastebin.com/Wdw4L7yT
An easier way might be to send me a PM with an email address and I could attach the two libraries to help. As long as they are for a kindle and not a nook or something.
How effective does the DX function with the 3.4.2 now?