I just had a look at your data. The only thing you have to be careful about is the shift in azimuth direction between both images:
Accordingly, when you start with TOPS Coregistration watch out that you select the correct burst numbers. In your case, the bursts between both images are shifted by 3. For example, bursts 1-2 in image 1 correspond to bursts 4-5 in image 2.