I wouldn't rule out 13C satellite peaks. The intensity seems right. The 13C-19F isotope shift can be fairly large, so the satellites wouldn't be symmetric. The isotope shift would be constant in ppm, but in Hz it would scale with field. The inner pair would probably be two-bond (maybe three bond???) and the outer pair would be one bond. Does this make any sense? The sure check would be if you had the facility to do 13C decoupling.

I wouldn't rule out 13C satellite peaks. The intensity seems right. The 13C-19F isotope shift can be fairly large, so the satellites wouldn't be symmetric. The isotope shift would be constant in ppm, but in Hz it would scale with field. The inner pair would probably be two-bond (maybe three bond???) and the outer pair would be one bond. Does this make any sense? The sure check would be if you had the facility to do 13C decoupling.

Update,

Just ran a trifluorotoluene sample on our AV 300. The one-bond JFC J(FC) that I see (273 Hz) is exactly the difference between your outer lines, and the longer range is the same as your inner lines. To compare the isotope shift, I would have to know what field your spectrometer is.