The latter prevails if the particle has a radius larger than a critical radius, which is around 1 µm in prominent BAW systems. This complicates the acoustic manipulation of bacteria, e.g. the biotechnological model organism and workhorse E. coli, as the critical radius overlaps with the typical cell dimensions. In general, to allow for efficient focusing of small particles in BAW devices, the acoustic streaming field needs to be suppressed or exhibit a particular shape; the vortices of the acoustic streaming field have to point towards the positions at which particles should be focused. Such a desired acoustic streaming field can be achieved either by square-shaped channels or by tailoring the acoustic impedance gradient. In a former publication, we utilized square-shaped channels to focus E. coli revealing a major difficulty to operate at high flow rates. With our new design, we generate a complementary streaming field, which assists the acoustic radiation force with particle trapping, thus allows us to manipulate particles that have sizes near the critical particle radius and outperforms our previous work by a factor of 25 in flow rate.