The way how I agitate my Paterson and LPL tank:

rotate ('tilt' might the right English word...) the tank 360 degrees (one full turn),
with the lid on the upside I turn it 90 degrees,
then do another 360 rotation,
all within about 6 seconds.

I'm beginning to to think that I over-filled my tank, but I'm not quite sure yet. I guess I should also improve my agitation?