Faster Way to Substract 2 Columns?

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Is there a faster, better way?

Perhaps

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Curiosity, why does this work so much better than my script?

Because access to the spreadsheet is limited to the minimum:
All data is read and put in memory in one shot: Wktb1 = WkRg, WkTb2 = WkRg
Treatment is done in memory
Complete result is written in one shot in the cells

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PCI,

It bugs on:

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in line:

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Can you send a short sample of your data, with mine it was OK
Perhaps try depending of your data

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It looks identical except it is in a table...but yours works in a table too...

PCI,

Your substitute line worked! Thanks!

Why did it work?

I have the "feeling" there is not only numbers in your data, that's why it is always better to have a sample ...!