When and what to flatten

Yes, the typical way to flatten will result in a pocket because as you note, the machine can’t reach the entire surface of all of the hybrid filler strips — if you wish to use stock larger than that, it is a problem.

The alternate way to handle this is to flatten the entire surface by removing and flipping the hybrid filler strips, flattening them, and then swapping them back.

Josh Tenny put a fair bit of effort into this:

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