Try passing the flag -H1 for a bit more speed. I get 225 kHash/s on 560Ti 448 core. The default is -H 0 which uses a non-parallel approach on the CPU to do the SHA256 hashing - while it reduces CPU load by about a third it also takes some percent off my kHash values on the fastest cards.
I am actually using -C 1 -i 0 -l F14x16 -H 1. What are your clock speeds? Here i have stock 732/1900.
I'll try downloading your updated repo and a fresh compile.
*edit* No, still the same.