Response to Push the slow or pull the fast?

Pushing actually does nothing to increase the true speed of a film. The inertia point, or the start of the toe of the film, which in turn determines the amount of shadow detail you get for a given exposure, stays firmly fixed.
Further, there is no B&W film on the market with a true speed of 1600 ISO. A so-called 1600 speed film might just have a true speed of something close to 800 ISO (unless it's Neopan 1600, which has an almost identical sensitivity to Neopan 400).
So, if you want more shadow detail than a 400 ISO film gives, your only real choice is a faster film, like Delta 3200, or TMZ3200. Both of those have a real ISO speed of around 1200.

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