The signal break up wasn't as bad in the goggles, I guess the DVR is a little more sensitive to the signal strength.
This was the first run with a Foxeer Monster V2 camera (as opposed to the cheap 800TVL camera I used before). Unfortunately, I had the goggles set t not record the audio feed, which is annoying.
Next step is to add radio comms (so I can tell people to put the car back on track if I'm a mile away :D )