The burble is there whether you are at 2 ft or 200 ft - it is just more noticeable at low level because of the way the vortices 'roll up' due to the proximity of the ground.
TL doesn't occur at 'very slight' airflows across the disc unless your definition of very slight is more than about 8 -10 kts.
Try a downwind transition in 10 to 15 kts of wind and you will clearly see the loss of ETL, the 'smooth phase' of zero airspeed and then the pronounced burble of ETL - that works in a downwind OGE transition as well.