SCW, I am sorry to hear this, not so much about the QRP part but mostly about the KX2.
Alright, I'm going to say that I've been experimenting with dial-back-the-100w-rig QRP since this spring. (It started out as a social thing, but after a while I was needing a QRP fix after a hard day at work, then whole weekends started disappearing...

) So far I've racked up exactly one voice contact where I jumped in on a net, and talked back to two other QRP stations who were doing the calling. In an emergency, I would not want to rely on QRP SSB in any way, shape, or form.
But that's not where it's at. A way to make QRP practical is with some digital mode, and I have been getting the 5 watt contacts there. Take a look at Fig. 3 in this article:
http://www.qsl.net/k4fk/presentations/Mode-sensitivity-2013-Dec-QST-Siwiak-Pontius-1.pdfNow let's look at CW at 5 watts, and compare to SSB voice. Fig. 3 shows CW as having a 17 dB advantage over SSB. Doing the math, CW at 5 watts has as much punch as SSB at 250 watts. Because I'm lazy and haven't yet picked up CW, let's look at PSK31 with its 24 dB advantage over SSB. Relative to a 100 watt SSB rig, operating at 5 watts PSK31 is like having 1,256 watts of SSB. Now, it is good practice to back off the power to about 1/4 when running a high duty cycle mode like PSK so as not to burn out the finals, but even then we're talking the equivalent of 314 watts SSB.
I think that's why OH8STN is getting the hits, while the guy in
this video out operating his FT-817 on SSB during the recent RaDAR challenge made only one QSO in four hours. So SCW, don't feel bad about not getting the QSOs in with that KX2. The bands have stunk on ice all this year, and QRP SSB isn't all that great to begin with.
I think for emergency use, unless you're just
reeeealy squeezing down to lessen backpack weight or such, QRO is the way to go. QRP is fun and works OK with digital, but in a pinch it's nice to have the option of voice comms too.