On the playback window, there is a set of numbers on the left and on the right. The numbers on the left control which frame that you're looking at. The numbers on the right control the speed (in frames per second). As you get close to the time that you want, lower the frames per second to something like 5 or 10. You can then watch it slowly cycle through the data.
I've also noticed that the OBD-2 scanner is set a bit slow. If you crank up the "Sample (Hz)" setting in the lower right hand corner of the window, it will refresh the data faster. This also gives you more accurate results. This reduces the lag between one reading and the next.
If you compare your data and mine, it takes yours over 2 seconds to cycle (from 15.7 to 17.8), whereas mine takes less than a second (from 40.6 to 41.5). Alot can happen in two seconds.
HTH,
BP