You may have touched on the issue yourself - other sources of income. In addition to your W-2 jobs, do you also have a Schedule C business reporting income on your tax return? If so, your large balance due could be due to self-employment income and not paying estimated taxes through the year to cover that tax. Take a look at your Form 1040 line 23 to see if there is amount shown there. If so, the self-employment tax could be the underlying problem instead of your withholdings.
Using TurboTax Live will allow an expert to review and file your current year return for you. That is not exactly what you were asking, but it is something to consider. Take a look at the following articles to learn more:
What if I need my return completely reviewed?
What is an Expert Review and how can I schedule one?
Otherwise, to compare two years together, you may need to find a local tax professional in your area.
@Khr77
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