Thanks for asking your question! I'm sorry to hear about your tax issue and I'm going to try my best to help you understand or resolve it.
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Based on your information, you are in the 25% tax bracket. Therefore, I would have 25% of your pension checks withheld. This will cover your tax
If you withhold 25% you will get a refund at the end of the year, as your marginal rate is only the rate at which the last $1 you earn is taxed.
Your effective rate is 15.1%
So, if you wanted to pay just enough tax to cover your bill, you should withhold 15%.
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Also, if you have social security earnings, 85% of those benefits will also be taxable based on your income level. Because of this, I would still lean towards withholding 25% of your pension checks to cover tax.