I had suggested the resampler on the presumption that perhaps your Transit was upsampling to 48K on its own (which adds artifacts) - plus you were using 384K on your DAC and 48K is a direct multiple.
I would assume that your DAC can tell you what rate it's receiving, so if the rate is 44.1K (no foobar resampler and no Transit upsample), then I would choose a multiple of this rate with the DAC (i.e 176.4K).
You could also try out changing the priority manually when foobar is running and see if the 'hitching' clears up. To do this, run foobar and press (Ctrl + ALt) + Del to invoke the Windows task manager. In the processes tab you'll see foobar. Select foobar in the list with the right mouse button and select Set Priority. Then select a higher priority - heck, you can go right up to Real Time..... anyway, something you can try.
brucek