I did do about a 6 or 7 min. pre-soak, with agitation most of the time, except when I was tempering the water for the developer, mixing, etc. I do tap the tank after agitation, but in this case I was processing at home where I process on my bed (don't like using the chemistry in the kitchen, and there are 3 of us in the apt., so I can't monopolise the bathroom) with a painters tarp over the bed (since I don't like my sheets smelling like chemistry, even if most of my cloths do), so I was just taping the tank with my knuckles, which might not be as effective as taping it vertically against a hard surface.

Peter