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All-Star wrote:

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I used to keep a pump up for spot spraying, but I kept having a problem with undissolved powder clogging up the tip.

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For pump up sprayers, you can do two things.
1 - increase the percentage of SHC a bit to compensate for the loss of the TSP and/or Borax
2 - Add a little Sodium Hydroxide, like one or two percent of the total mix.
The Sodium Hydroxide addition does two things,
1 - is stabalizes the chlorine/water mix
2 - it makes it a bit stronger cleaner by raising the PH.
The hyperchlorite ION is what does the cleaning in SHC
It is most active at high PH.