Your report is very appreciated sir, hope to hear back as you learn more from it. The receiver report is kind of a bummer.
I have just worked a heap of SSB DX with the Alinco DX-10. Here are some more comments:
The RX is HOT! Too hot. You have to run the RF Gain at no more than 3/4 or you will be overloading the RX. I can still hear everything that my AT-5555Nii can hear, at this lower RF Gain setting, so that's not a real issue but something you need to be aware of. (For reference, the AT-5555Nii is an amazing performer in every way).
The AGC is average. Strong signals are very LOUD, weak signals are not (from a volume point of view). You need to keep on top of the Volume control to keep the audio output where you want it.
The SSB clarification is critical. You have to get it exactly right, or the RX does start to distort. I'm not sure exactly why this is the case (maybe an internal mixing/filter issue?) But it matters. 20Hz off is enough to make the SSB RX sound rough. So keep on the clarifier control (which works well on this radio).
TX audio reports were excellent.
AM/FM seems to work great.
That might sound like a lot of bad points - however, despite all that I had a great time using this radio!. It's fun, it keeps you busy tweaking, and when you get it right, it's great! It's just a lot more work than many other radios, and some people might not want to deal with that.
I configured my DX-10 with the PC software. This makes life a lot easier if you are familiar with radio programming.
Overall, I like it, it's a different beast with some RX quirks, but it is still a very capable and fun little radio for a cheap price.