Ok, managed to fix it with a couple of tweaks:

--shaders 1792 --intensity 16 --worksize 256 -g 1 --thread-concurrency 21712  --lookup-gap 2 --gpu-engine 1000 --gpu-memclock 1400

lowered the gpu engine and meclock, and upped int by 1. Going fine so far. I'll let it run for a while longer, see if anything comes up.

On a side note: the GPU seems to be running a bit hotter, might drop Int back down to prevent it.


EDIT: I rummaged through some of the CGminer options, and it lists my current gpu engine at 810 rather than the 1000 my batch file asks for. Any suggestions?