Keep in mind that even if you test TT, you still have almost a one in three chance of clearing the virus with 24 weeks tx. People have txd much longer with much worse odds, so unless your sx are totally unbearable, you might want to give it a shot.
http://www.gastrojournal.org/article/S0016-5085(10)00841-3/abstract
"among patients who failed to attain RVR (VD24 SVR rates: CC, 87%; CT, 67%; and TT, 29%"