294 with a 350 grain arrow? That is about what I would expect considering that they advertise only a 1-2 fps loss with their use. That TS must weigh quite a bit over 400 grains to slow down your arrow speed by close to 33 fps over what you were getting with the 400 grain arrow.
It is fun to play around with the chrono and different setups...isn' t it? I usually end up fooling with it during the winter months when I have more time on my hands...