TurboTax generally does not use the "tables" for depreciation; it uses a different mathematical formula to calculate it.
Using the mathematical formula (well, at least the way Intuit does it, which is possibly questionable) changing business percentage has those kind of results. Changing to a higher business percentage will result in additional depreciation (like it is trying to 'speed' on the depreciation to match the higher business percentage) and changing to a lower business percentage will result in low depreciation (like it is trying to 'slow down' on the depreciation due to a lower business percentage).
