I would expect your #1 to equal the sum of your #2 and #3. If not then something doesn't feel quite right.
Instead of box 14 code E, what happens if you look at the trust's 1041 line 9 (total income) and apply your beneficiary %? The 14/E may be reduced by a share of trust expenses (1040 lines 10-22) and possibly (though not commonly) be off because the trust has non-investment income (e.g. running an operating business?)
In the 1116 process this is all getting at the data needed to computer the tax code section 904 limitation on the foreign-tax credit. https://www.law.cornell.edu/uscode/text/26/904 :
(a)Limitation
The total amount of the credit taken under section 901(a) shall not exceed the same proportion of the tax against which such credit is taken which the taxpayer’s taxable income from sources without the United States (but not in excess of the taxpayer’s entire taxable income) bears to his entire taxable income for the same taxable year.
perhaps more understandable, the FTC is limited to
US tax liability times [foreign-sourced income / worldwide income]
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